From wchast at gmail.com  Sat May 12 09:14:15 2018
From: wchast at gmail.com (Chuck Hast)
Date: Sat, 12 May 2018 08:14:15 -0500
Subject: [Laser] Is it sill alive? If so I have a question.
Message-ID: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>

Are people still on here? have not seen anything in a while. But if there is
anyone, I have a question.


-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From waisean at gmail.com  Sat May 12 09:24:25 2018
From: waisean at gmail.com (Sean Waite)
Date: Sat, 12 May 2018 09:24:25 -0400
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
Message-ID: <CAGz_XJw5Fk9xX7+s=XD4HNXX_=ZmHZw0QbanSknJ+tz1ggS98g@mail.gmail.com>

There's at least a few people on it.

73
Sean WA1TE

On Sat, May 12, 2018 at 9:14 AM Chuck Hast <wchast at gmail.com> wrote:

> Are people still on here? have not seen anything in a while. But if there
> is
> anyone, I have a question.
>
>
> --
>
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From ky1k at myfairpoint.net  Sat May 12 10:01:47 2018
From: ky1k at myfairpoint.net (Art)
Date: Sat, 12 May 2018 10:01:47 -0400
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CAGz_XJw5Fk9xX7+s=XD4HNXX_=ZmHZw0QbanSknJ+tz1ggS98g@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CAGz_XJw5Fk9xX7+s=XD4HNXX_=ZmHZw0QbanSknJ+tz1ggS98g@mail.gmail.com>
Message-ID: <3a99bda9-dec4-f05c-391e-3cd0d04c8bc9@myfairpoint.net>

I'm still here, KY1K (now W1ABA)

73, Art



On 05/12/2018 09:24 AM, Sean Waite wrote:
> There's at least a few people on it.
>
> 73
> Sean WA1TE
>
> On Sat, May 12, 2018 at 9:14 AM Chuck Hast <wchast at gmail.com> wrote:
>
>> Are people still on here? have not seen anything in a while. But if there
>> is
>> anyone, I have a question.
>>
>>
>> --
>>
>> Chuck Hast  -- KP4DJT --
>> I can do all things through Christ which strengtheneth me.
>> Ph 4:13 KJV
>> Todo lo puedo en Cristo que me fortalece.
>> Fil 4:13 RVR1960
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>


From glennt at gbis.com  Sat May 12 10:32:57 2018
From: glennt at gbis.com (Glenn Thomas)
Date: Sat, 12 May 2018 07:32:57 -0700
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <3a99bda9-dec4-f05c-391e-3cd0d04c8bc9@myfairpoint.net>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CAGz_XJw5Fk9xX7+s=XD4HNXX_=ZmHZw0QbanSknJ+tz1ggS98g@mail.gmail.com>
	<3a99bda9-dec4-f05c-391e-3cd0d04c8bc9@myfairpoint.net>
Message-ID: <BBFE9C4F-BC71-423A-B2D8-CFA7E2D26914@gbis.com>

So what is the question?

Fat fingered from my diePhone, corrected by diePhone spellchunk . Errors are guaranteed. 

> On May 12, 2018, at 7:01 AM, Art <ky1k at myfairpoint.net> wrote:
> 
> I'm still here, KY1K (now W1ABA)
> 
> 73, Art
> 
> 
> 
>> On 05/12/2018 09:24 AM, Sean Waite wrote:
>> There's at least a few people on it.
>> 
>> 73
>> Sean WA1TE
>> 
>>> On Sat, May 12, 2018 at 9:14 AM Chuck Hast <wchast at gmail.com> wrote:
>>> 
>>> Are people still on here? have not seen anything in a while. But if there
>>> is
>>> anyone, I have a question.
>>> 
>>> 
>>> --
>>> 
>>> Chuck Hast  -- KP4DJT --
>>> I can do all things through Christ which strengtheneth me.
>>> Ph 4:13 KJV
>>> Todo lo puedo en Cristo que me fortalece.
>>> Fil 4:13 RVR1960
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>>> 
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
>> 
> 
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> 


From w9sz.zack at gmail.com  Sat May 12 10:33:29 2018
From: w9sz.zack at gmail.com (Zack Widup)
Date: Sat, 12 May 2018 09:33:29 -0500
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
Message-ID: <CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>

I'm still here. Haven't seen any activity on this group in ages. Go ahead
with your question!

73, Zack W9SZ

On Sat, May 12, 2018 at 8:14 AM, Chuck Hast <wchast at gmail.com> wrote:

> Are people still on here? have not seen anything in a while. But if there
> is
> anyone, I have a question.
>
>
> --
>
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From glennt at gbis.com  Sat May 12 10:48:35 2018
From: glennt at gbis.com (Glenn Thomas)
Date: Sat, 12 May 2018 07:48:35 -0700
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
Message-ID: <f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>

FWIW, the last message I had on this group was August 12, 2016...

On 5/12/2018 7:33 AM, Zack Widup wrote:
> I'm still here. Haven't seen any activity on this group in ages. Go ahead
> with your question!
>
> 73, Zack W9SZ
>
>

-- 
"i" before "e" except after "c", or when sounded as "a" as in neighbor and weigh.

This rule is ?counterfeit?. General spelling rules ?forfeit? generality. 
They are ?foreign?, being not ?either? or ?neither?, possibly the result of some 
?leisure? activity of a ?sovereign heir? who, lacking ?height?, is studying, 
without ?conscience, inefficient glacier science?. It?s not as nutritious 
as "protein". It's just plain old "weird"

Is this example ?sufficient??



From john at generalrobots.com  Sat May 12 12:01:29 2018
From: john at generalrobots.com (John McNulty)
Date: Sat, 12 May 2018 17:01:29 +0100
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
Message-ID: <A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>

Greetings All,

Perhaps there?s a learned paper title forthcoming?

"Loop-back Latency in Laser Links" ;-)

Best Wishes to All,

J McN

> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
> 
> FWIW, the last message I had on this group was August 12, 2016...
> 
> On 5/12/2018 7:33 AM, Zack Widup wrote:
>> I'm still here. Haven't seen any activity on this group in ages. Go ahead
>> with your question!
>> 
>> 73, Zack W9SZ
>> 
>> 
> 
> -- 
> "i" before "e" except after "c", or when sounded as "a" as in neighbor and weigh.
> 
> This rule is ?counterfeit?. General spelling rules ?forfeit? generality. 
> They are ?foreign?, being not ?either? or ?neither?, possibly the result of some 
> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is studying, 
> without ?conscience, inefficient glacier science?. It?s not as nutritious 
> as "protein". It's just plain old "weird"
> 
> Is this example ?sufficient??
> 
> 
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From bernies at panix.com  Sat May 12 12:33:16 2018
From: bernies at panix.com (bernieS)
Date: Sat, 12 May 2018 12:33:16 -0400
Subject: [Laser] US accuses China of pointing LASERs at US military aircraft
Message-ID: <mailman.89.1526142814.9986.laser@mailman.qth.net>


http://www.businessinsider.com/these-are-the-4-blinding-laser-weapons-that-china-has-developed-2018-5

These are China's laser weapons that have 
reportedly been targeting US planes in 'an act just short of war'

<http://www.businessinsider.com/author/daniel-brown>Daniel Brown
May. 4, 2018, 3:34 PM


The US accused China on Thursday of pointing 
lasers at US military aircraft near Djibouti 
multiple times in the past few weeks. Beijing has denied the allegations.

US officials told The Wall Street Journal that 
there had been at least four such incidents near 
Djibouti and that in one of the latest two C-130 
pilots became dizzy and saw "rings."

Since 2015, China has had at least four different 
kinds of blinding laser weapons: the BBQ-905 
Laser Dazzler Weapon, the WJG-2002 Laser Gun, the 
PY132A Blinding Laser Weapon, and the PY131A Blinding Laser Weapon.


The Pentagon 
<http://www.businessinsider.com/us-says-chinese-laser-attacks-injured-plane-crews-china-strongly-denies-2018-5>formally 
complained to the Chinese government on Thursday, 
accusing Chinese nationals of pointing lasers at 
US military aircraft near Djibouti, in east 
Africa, multiple times in the past few weeks.

"They are very serious incidents," Dana White, a 
Pentagon spokeswoman, told reporters, adding: "We 
have formally d?marched the Chinese government, 
and we've requested the Chinese investigate these incidents."

The Chinese Defense Ministry, which has a 
military base just miles from the US's Camp 
Lemonnier in Djibouti, denied the accusations.

China's naval base in Djibouti, 
<https://www.reuters.com/article/us-china-djibouti/china-formally-opens-first-overseas-military-base-in-djibouti-idUSKBN1AH3E3>which 
opened last year, is Beijing's first overseas military base.

Citing military officials, 
<https://www.wsj.com/articles/laser-from-chinese-base-aimed-at-u-s-military-pilots-in-africas-skies-pentagon-charges-1525351775>The 
Wall Street Journal reported Thursday that in 
past weeks, there had been at least four 
incidents in which US service members have been 
targeted with military-grade or 
non-military-grade lasers originating near a 
Chinese military installation in Djibouti. There 
have also been additional incidents occurring 
within US Pacific Command, the officials said.

Since 2015, China has had at least four kinds of 
blinding laser weapons: the BBQ-905 Laser Dazzler 
Weapon, the WJG-2002 Laser Gun, the PY132A 
Blinding Laser Weapon, and the PY131A Blinding Laser Weapon.

Laser Weapon System (LaWS) on Ponce
The Laser Weapon System on the USS Ponce. US Navy

The four weapons "look like oversized assault 
rifles or shoulder-fired grenade launchers," 
<http://www.thedrive.com/the-war-zone/20615/us-military-says-chinese-lasers-injured-pilots-flying-a-c-130-near-its-base-in-djibouti>according 
to The War Zone. They could possibly violate the 
United Nations Protocol on Blinding Laser Weapons 
that Beijing signed in 1998, 
<http://freebeacon.com/national-security/chinese-military-using-blinding-laser-weapons/>The 
Washington Free Beacon reported.

In a recent incident, two C-130 pilots became 
dizzy and saw "rings," a Pentagon official told 
The Journal, adding that they are recovering.

"These incidents are not surprising as they 
represent an act just short of war, but indicate 
gross, intentional negligence, as well as 
complete disregard for aviation safety and 
international norms," Trey Meeks, a principal at 
the Asia Group research firm, told The Journal. 
"I would certainly view it as harassment."

US pilots have begun wearing eye protection or 
visors for protection and are even planning their 
flights around Chinese military flights, The Journal reported.

The US military has issued a Notice to Airmen 
about "multiple lazing events involving a high 
power laser" in Djibouti, saying to "use extreme 
caution when transiting near this area," 
<https://thediplomat.com/2018/05/possible-use-of-blinding-laser-weapon-near-chinas-djibouti-base-spurs-us-warning-to-aviators/>according 
to The Diplomat. The Federal Aviation 
Administration also sent the notice in April.

The incidents come at a contentious time in 
US-China relations. US President Donald Trump has 
announced tariffs on Chinese goods and 
restrictions on certain US technology exports.

China and Russia have also recently 
<http://www.businessinsider.com/china-russia-military-political-partnership-us-2018-4>forged 
a military partnership, which China's defense 
minister said would "let the Americans know about 
the close ties between the armed forces of China and Russia."


SEE ALSO: 
<http://www.businessinsider.com/china-laser-weapons-2018-5>8 
tactical laser weapons China has recently developed  

From sjnoll at ix.netcom.com  Sat May 12 13:40:11 2018
From: sjnoll at ix.netcom.com (Steve J. Noll)
Date: Sat, 12 May 2018 10:40:11 -0700
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
Message-ID: <258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>

I'm still here too. But lost everything in the California fire in December.
Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
Hope to be back and running in a year or so.

73, Steve WA6EJO
http://www.qrz.com/db/WA6EJO


On 5/12/2018 6:14 AM, Chuck Hast wrote:
> Are people still on here? have not seen anything in a while. But if there is
> anyone, I have a question.
>
>


From theis.kurt at gmail.com  Sat May 12 15:01:44 2018
From: theis.kurt at gmail.com (Kurt Theis)
Date: Sat, 12 May 2018 15:01:44 -0400
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
Message-ID: <CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>

Looks like a few are still on. How can we help?

Kurt Theis
https://landfallnet.blogspot.com
theis.kurt at gmail.com

On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> I'm still here too. But lost everything in the California fire in December.
> Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> Hope to be back and running in a year or so.
>
> 73, Steve WA6EJO
> http://www.qrz.com/db/WA6EJO
>
>
> On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > Are people still on here? have not seen anything in a while. But if
> there is
> > anyone, I have a question.
> >
> >
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From n6gkj.cm98 at yahoo.com  Sat May 12 16:21:30 2018
From: n6gkj.cm98 at yahoo.com (Ron Simpson)
Date: Sat, 12 May 2018 20:21:30 +0000 (UTC)
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
Message-ID: <1554422941.542933.1526156490210@mail.yahoo.com>

Hey Kurt!
I'm still here. Kurt and I did some laser and LED experiments. My receiver could hear light beacons at 30 miles. I still want to play with optical comms. I think we should organize a West Coast light show.
There are some guys in the SF Bay Area with Ladio Systems

Ron Simpson, N6GKJ
http://n6gkj.lodiarc.org
 
 
  On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com> wrote:   Looks like a few are still on. How can we help?

Kurt Theis
https://landfallnet.blogspot.com
theis.kurt at gmail.com

On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> I'm still here too. But lost everything in the California fire in December.
> Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> Hope to be back and running in a year or so.
>
> 73, Steve WA6EJO
> http://www.qrz.com/db/WA6EJO
>
>
> On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > Are people still on here? have not seen anything in a while. But if
> there is
> > anyone, I have a question.
> >
> >
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
Laser mailing list
Home: http://mailman.qth.net/mailman/listinfo/laser
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Laser at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
  

From n6gkj.cm98 at yahoo.com  Sat May 12 16:21:30 2018
From: n6gkj.cm98 at yahoo.com (Ron Simpson)
Date: Sat, 12 May 2018 20:21:30 +0000 (UTC)
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
Message-ID: <1554422941.542933.1526156490210@mail.yahoo.com>

Hey Kurt!
I'm still here. Kurt and I did some laser and LED experiments. My receiver could hear light beacons at 30 miles. I still want to play with optical comms. I think we should organize a West Coast light show.
There are some guys in the SF Bay Area with Ladio Systems

Ron Simpson, N6GKJ
http://n6gkj.lodiarc.org
 
 
  On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com> wrote:   Looks like a few are still on. How can we help?

Kurt Theis
https://landfallnet.blogspot.com
theis.kurt at gmail.com

On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> I'm still here too. But lost everything in the California fire in December.
> Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> Hope to be back and running in a year or so.
>
> 73, Steve WA6EJO
> http://www.qrz.com/db/WA6EJO
>
>
> On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > Are people still on here? have not seen anything in a while. But if
> there is
> > anyone, I have a question.
> >
> >
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
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>
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From kbanke at sbcglobal.net  Sat May 12 16:33:20 2018
From: kbanke at sbcglobal.net (Kerry Banke)
Date: Sat, 12 May 2018 20:33:20 +0000 (UTC)
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <1554422941.542933.1526156490210@mail.yahoo.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
	<1554422941.542933.1526156490210@mail.yahoo.com>
Message-ID: <579676917.570866.1526157200259@mail.yahoo.com>

I'm still here also in San Diego. Haven't found? any interest here in recent years so all my gear is sitting in boxes. My longest experiments yielded 15 miles NLOS and 60miles LOS. The gear can do more but that's what was local and convenient at the time. Also getting more nervous about using Lasers from hilltops these days. I do have a retroreflector on a hill some 3+miles away that is great for testing from my back yard.?- Kerry N6IZW

      From: Ron Simpson via Laser <laser at mailman.qth.net>
 To: Free Space LASER Communications <laser at mailman.qth.net>; Kurt Theis <theis.kurt at gmail.com>; Free Space LASER Communications <laser at mailman.qth.net> 
 Sent: Saturday, May 12, 2018 1:22 PM
 Subject: Re: [Laser] Is it sill alive? If so I have a question.
   
Hey Kurt!
I'm still here. Kurt and I did some laser and LED experiments. My receiver could hear light beacons at 30 miles. I still want to play with optical comms. I think we should organize a West Coast light show.
There are some guys in the SF Bay Area with Ladio Systems

Ron Simpson, N6GKJ
http://n6gkj.lodiarc.org
 
 
? On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com> wrote:? Looks like a few are still on. How can we help?

Kurt Theis
https://landfallnet.blogspot.com
theis.kurt at gmail.com

On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> I'm still here too. But lost everything in the California fire in December.
> Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> Hope to be back and running in a year or so.
>
> 73, Steve WA6EJO
> http://www.qrz.com/db/WA6EJO
>
>
> On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > Are people still on here? have not seen anything in a while. But if
> there is
> > anyone, I have a question.
> >
> >
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
______________________________________________________________
Laser mailing list
Home: http://mailman.qth.net/mailman/listinfo/laser
Help: http://mailman.qth.net/mmfaq.htm
Post: mailto:Laser at mailman.qth.net

This list hosted by: http://www.qsl.net
Please help support this email list: http://www.qsl.net/donate.html
? 
______________________________________________________________
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Please help support this email list: http://www.qsl.net/donate.html


   

From w9sz.zack at gmail.com  Sat May 12 17:26:25 2018
From: w9sz.zack at gmail.com (Zack Widup)
Date: Sat, 12 May 2018 16:26:25 -0500
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <579676917.570866.1526157200259@mail.yahoo.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
	<1554422941.542933.1526156490210@mail.yahoo.com>
	<579676917.570866.1526157200259@mail.yahoo.com>
Message-ID: <CANJxhWgyFbK9ACi=zyWk1OcYMPu8CaZMqLCaT6vAsb7fREyvbg@mail.gmail.com>

I'm working on going up the bands one at a time. Maybe I'll get a
laser/light comm system together this year. But I got on 47 GHz as a new
band last year and successfully made some contacts on that band. Now
finishing up on 78 GHz. A laser system would be a LOT simpler than these
bands!

73, Zack W9SZ


On Sat, May 12, 2018 at 3:33 PM, Kerry Banke <kbanke at sbcglobal.net> wrote:

> I'm still here also in San Diego. Haven't found  any interest here in
> recent years so all my gear is sitting in boxes. My longest experiments
> yielded 15 miles NLOS and 60miles LOS. The gear can do more but that's what
> was local and convenient at the time. Also getting more nervous about using
> Lasers from hilltops these days. I do have a retroreflector on a hill some
> 3+miles away that is great for testing from my back yard. - Kerry N6IZW
>
>       From: Ron Simpson via Laser <laser at mailman.qth.net>
>  To: Free Space LASER Communications <laser at mailman.qth.net>; Kurt Theis <
> theis.kurt at gmail.com>; Free Space LASER Communications <
> laser at mailman.qth.net>
>  Sent: Saturday, May 12, 2018 1:22 PM
>  Subject: Re: [Laser] Is it sill alive? If so I have a question.
>
> Hey Kurt!
> I'm still here. Kurt and I did some laser and LED experiments. My receiver
> could hear light beacons at 30 miles. I still want to play with optical
> comms. I think we should organize a West Coast light show.
> There are some guys in the SF Bay Area with Ladio Systems
>
> Ron Simpson, N6GKJ
> http://n6gkj.lodiarc.org
>
>
>   On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com>
> wrote:  Looks like a few are still on. How can we help?
>
> Kurt Theis
> https://landfallnet.blogspot.com
> theis.kurt at gmail.com
>
> On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com> wrote:
>
> > I'm still here too. But lost everything in the California fire in
> December.
> > Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> > Hope to be back and running in a year or so.
> >
> > 73, Steve WA6EJO
> > http://www.qrz.com/db/WA6EJO
> >
> >
> > On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > > Are people still on here? have not seen anything in a while. But if
> > there is
> > > anyone, I have a question.
> > >
> > >
> >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From wchast at gmail.com  Sat May 12 19:47:16 2018
From: wchast at gmail.com (Chuck Hast)
Date: Sat, 12 May 2018 18:47:16 -0500
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
Message-ID: <CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>

Nuu, no paper, just a question. I am building a spectrograph to measure the
wavelength of lasers I am incorporating into some tools.

Some years back I built one to determine the wavelength of lasers I was
using
in glass container inspectors. The thing was spot on, I checked the device
using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it was
well within 5nm of what it should have been.

I have built one just recently, but I am not getting anywhere near the
precision
I was getting with the one back then. I have tested it with one of the DPSS
lasers I used on the original one. I do not have a HeNe here at this moment
so not sure where the red end is.

The  original used a grate at 300 L/mm, figuring on greater accuracy I
bought
the 1000 L/mm grate.

The series of test I have done have given me about 548nm for a 532nm DPSS
laser, that is way off. The only real difference between the original
instrument
and this one is the grating is 1000 L/mm, the original was 300 L/mm. The
only
thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but something
more. I guess I will have to reverse the calculations and see if I can
determine
the real number of lines/mm.

I may also buy a 300 L/mm grate, then I will have it all the same as the
original.


Wonder if anyone else has run into this sort of thing.



On Sat, May 12, 2018 at 11:01 AM, John McNulty <john at generalrobots.com>
wrote:

> Greetings All,
>
> Perhaps there?s a learned paper title forthcoming?
>
> "Loop-back Latency in Laser Links" ;-)
>
> Best Wishes to All,
>
> J McN
>
> > On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
> >
> > FWIW, the last message I had on this group was August 12, 2016...
> >
> > On 5/12/2018 7:33 AM, Zack Widup wrote:
> >> I'm still here. Haven't seen any activity on this group in ages. Go
> ahead
> >> with your question!
> >>
> >> 73, Zack W9SZ
> >>
> >>
> >
> > --
> > "i" before "e" except after "c", or when sounded as "a" as in neighbor
> and weigh.
> >
> > This rule is ?counterfeit?. General spelling rules ?forfeit? generality.
> > They are ?foreign?, being not ?either? or ?neither?, possibly the result
> of some
> > ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
> studying,
> > without ?conscience, inefficient glacier science?. It?s not as
> nutritious
> > as "protein". It's just plain old "weird"
> >
> > Is this example ?sufficient??
> >
> >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From wchast at gmail.com  Sat May 12 20:01:11 2018
From: wchast at gmail.com (Chuck Hast)
Date: Sat, 12 May 2018 19:01:11 -0500
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CANJxhWgyFbK9ACi=zyWk1OcYMPu8CaZMqLCaT6vAsb7fREyvbg@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
	<1554422941.542933.1526156490210@mail.yahoo.com>
	<579676917.570866.1526157200259@mail.yahoo.com>
	<CANJxhWgyFbK9ACi=zyWk1OcYMPu8CaZMqLCaT6vAsb7fREyvbg@mail.gmail.com>
Message-ID: <CADNfBV_4-kqa-AQNan-jRnBFSQSevH1F5su5h0WTHv56O8R7tA@mail.gmail.com>

I just tossed my question out there, I had noticed a BIG drop off in
activity. Sure
seems that we should still be pushing at it. But you get all overloaded
with other
stuff and that laser project keeps on getting further and further down the
road.

What with the proliferation of diodes from one end of the spectrum to the
other
with the absence of only amber (yea, you can do it with a DPSS setup but it
is
not efficient and expensive) be interesting to see what can be done with the
newer wavelengths. Of course we know that green and up are going to see
more and more attenuation but still be interesting to see what can be done.

I ordered some 515nm diodes the other day from China, when I got them they
sure looked more like 495nm vice 515. That is the first job that goes on my
spectrogaph as soon as I get the thing to show me the numbers they way they
should be.

That said there is a lot of stuff out there that may make the FSO even more
fun to do.

By way many of the low power green diodes are also TEM00 mode for what
ever it is worth.

On Sat, May 12, 2018 at 4:26 PM, Zack Widup <w9sz.zack at gmail.com> wrote:

> I'm working on going up the bands one at a time. Maybe I'll get a
> laser/light comm system together this year. But I got on 47 GHz as a new
> band last year and successfully made some contacts on that band. Now
> finishing up on 78 GHz. A laser system would be a LOT simpler than these
> bands!
>
> 73, Zack W9SZ
>
>
> On Sat, May 12, 2018 at 3:33 PM, Kerry Banke <kbanke at sbcglobal.net> wrote:
>
> > I'm still here also in San Diego. Haven't found  any interest here in
> > recent years so all my gear is sitting in boxes. My longest experiments
> > yielded 15 miles NLOS and 60miles LOS. The gear can do more but that's
> what
> > was local and convenient at the time. Also getting more nervous about
> using
> > Lasers from hilltops these days. I do have a retroreflector on a hill
> some
> > 3+miles away that is great for testing from my back yard. - Kerry N6IZW
> >
> >       From: Ron Simpson via Laser <laser at mailman.qth.net>
> >  To: Free Space LASER Communications <laser at mailman.qth.net>; Kurt
> Theis <
> > theis.kurt at gmail.com>; Free Space LASER Communications <
> > laser at mailman.qth.net>
> >  Sent: Saturday, May 12, 2018 1:22 PM
> >  Subject: Re: [Laser] Is it sill alive? If so I have a question.
> >
> > Hey Kurt!
> > I'm still here. Kurt and I did some laser and LED experiments. My
> receiver
> > could hear light beacons at 30 miles. I still want to play with optical
> > comms. I think we should organize a West Coast light show.
> > There are some guys in the SF Bay Area with Ladio Systems
> >
> > Ron Simpson, N6GKJ
> > http://n6gkj.lodiarc.org
> >
> >
> >   On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com>
> > wrote:  Looks like a few are still on. How can we help?
> >
> > Kurt Theis
> > https://landfallnet.blogspot.com
> > theis.kurt at gmail.com
> >
> > On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com>
> wrote:
> >
> > > I'm still here too. But lost everything in the California fire in
> > December.
> > > Slowly rebuilding the lab, haven't got to the electro-optic stuff yet.
> > > Hope to be back and running in a year or so.
> > >
> > > 73, Steve WA6EJO
> > > http://www.qrz.com/db/WA6EJO
> > >
> > >
> > > On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > > > Are people still on here? have not seen anything in a while. But if
> > > there is
> > > > anyone, I have a question.
> > > >
> > > >
> > >
> > > ______________________________________________________________
> > > Laser mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/laser
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:Laser at mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> >
> >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From aj6t at comcast.net  Sat May 12 21:29:03 2018
From: aj6t at comcast.net (Walter Miller, AJ6T)
Date: Sat, 12 May 2018 18:29:03 -0700
Subject: [Laser] Any Optical Comm Activity in Alabama?
In-Reply-To: <CADNfBV_4-kqa-AQNan-jRnBFSQSevH1F5su5h0WTHv56O8R7tA@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
	<1554422941.542933.1526156490210@mail.yahoo.com>
	<579676917.570866.1526157200259@mail.yahoo.com>
	<CANJxhWgyFbK9ACi=zyWk1OcYMPu8CaZMqLCaT6vAsb7fREyvbg@mail.gmail.com>
	<CADNfBV_4-kqa-AQNan-jRnBFSQSevH1F5su5h0WTHv56O8R7tA@mail.gmail.com>
Message-ID: <f43e549b-b985-e81f-a093-2b54f515a493@comcast.net>

Very nice to see a surge in activity on this list.? I hope some of us on 
the list will be inspired to make laser or LED QSOs.
I recently moved from the SF Bay Area (where I made a few 20 mile QSOs 
with WB9AJZ/N9JIM using laser pointers many years ago) to Madison, 
Alabama.? Are there any experimenters in the Huntsville area who would 
like to try some free space optical communications?

73, Walt, AJ6T (EM64)

From waisean at gmail.com  Sun May 13 00:56:33 2018
From: waisean at gmail.com (Sean Waite)
Date: Sun, 13 May 2018 00:56:33 -0400
Subject: [Laser] Is it sill alive? If so I have a question.
In-Reply-To: <CADNfBV_4-kqa-AQNan-jRnBFSQSevH1F5su5h0WTHv56O8R7tA@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<258203ee-8d9a-fa5e-a653-7d774ac561fc@ix.netcom.com>
	<CACbsfiHTyp81MEq6D_+duStvRNMdYgvwrUNqsqRgB4+gg1PHfA@mail.gmail.com>
	<1554422941.542933.1526156490210@mail.yahoo.com>
	<579676917.570866.1526157200259@mail.yahoo.com>
	<CANJxhWgyFbK9ACi=zyWk1OcYMPu8CaZMqLCaT6vAsb7fREyvbg@mail.gmail.com>
	<CADNfBV_4-kqa-AQNan-jRnBFSQSevH1F5su5h0WTHv56O8R7tA@mail.gmail.com>
Message-ID: <CAGz_XJyw5SavcBtWDns+JOQMDX48FLyx=GTAgkEKpjVBfH5Z9Q@mail.gmail.com>

I keep starting to try and build out KA7OEI's optical transmitter/receivers
in Eagle and/or KiCad, but keep getting distracted. I could build the parts
on perf board, but I thought it might be nice to have actual PCBs. Maybe
I'll restart that project one of these days.

Sean WA1TE

On Sat, May 12, 2018 at 8:01 PM Chuck Hast <wchast at gmail.com> wrote:

> I just tossed my question out there, I had noticed a BIG drop off in
> activity. Sure
> seems that we should still be pushing at it. But you get all overloaded
> with other
> stuff and that laser project keeps on getting further and further down the
> road.
>
> What with the proliferation of diodes from one end of the spectrum to the
> other
> with the absence of only amber (yea, you can do it with a DPSS setup but it
> is
> not efficient and expensive) be interesting to see what can be done with
> the
> newer wavelengths. Of course we know that green and up are going to see
> more and more attenuation but still be interesting to see what can be done.
>
> I ordered some 515nm diodes the other day from China, when I got them they
> sure looked more like 495nm vice 515. That is the first job that goes on my
> spectrogaph as soon as I get the thing to show me the numbers they way they
> should be.
>
> That said there is a lot of stuff out there that may make the FSO even more
> fun to do.
>
> By way many of the low power green diodes are also TEM00 mode for what
> ever it is worth.
>
> On Sat, May 12, 2018 at 4:26 PM, Zack Widup <w9sz.zack at gmail.com> wrote:
>
> > I'm working on going up the bands one at a time. Maybe I'll get a
> > laser/light comm system together this year. But I got on 47 GHz as a new
> > band last year and successfully made some contacts on that band. Now
> > finishing up on 78 GHz. A laser system would be a LOT simpler than these
> > bands!
> >
> > 73, Zack W9SZ
> >
> >
> > On Sat, May 12, 2018 at 3:33 PM, Kerry Banke <kbanke at sbcglobal.net>
> wrote:
> >
> > > I'm still here also in San Diego. Haven't found  any interest here in
> > > recent years so all my gear is sitting in boxes. My longest experiments
> > > yielded 15 miles NLOS and 60miles LOS. The gear can do more but that's
> > what
> > > was local and convenient at the time. Also getting more nervous about
> > using
> > > Lasers from hilltops these days. I do have a retroreflector on a hill
> > some
> > > 3+miles away that is great for testing from my back yard. - Kerry N6IZW
> > >
> > >       From: Ron Simpson via Laser <laser at mailman.qth.net>
> > >  To: Free Space LASER Communications <laser at mailman.qth.net>; Kurt
> > Theis <
> > > theis.kurt at gmail.com>; Free Space LASER Communications <
> > > laser at mailman.qth.net>
> > >  Sent: Saturday, May 12, 2018 1:22 PM
> > >  Subject: Re: [Laser] Is it sill alive? If so I have a question.
> > >
> > > Hey Kurt!
> > > I'm still here. Kurt and I did some laser and LED experiments. My
> > receiver
> > > could hear light beacons at 30 miles. I still want to play with optical
> > > comms. I think we should organize a West Coast light show.
> > > There are some guys in the SF Bay Area with Ladio Systems
> > >
> > > Ron Simpson, N6GKJ
> > > http://n6gkj.lodiarc.org
> > >
> > >
> > >   On Sat, May 12, 2018 at 12:02 PM, Kurt Theis<theis.kurt at gmail.com>
> > > wrote:  Looks like a few are still on. How can we help?
> > >
> > > Kurt Theis
> > > https://landfallnet.blogspot.com
> > > theis.kurt at gmail.com
> > >
> > > On Sat, May 12, 2018, 1:40 PM Steve J. Noll <sjnoll at ix.netcom.com>
> > wrote:
> > >
> > > > I'm still here too. But lost everything in the California fire in
> > > December.
> > > > Slowly rebuilding the lab, haven't got to the electro-optic stuff
> yet.
> > > > Hope to be back and running in a year or so.
> > > >
> > > > 73, Steve WA6EJO
> > > > http://www.qrz.com/db/WA6EJO
> > > >
> > > >
> > > > On 5/12/2018 6:14 AM, Chuck Hast wrote:
> > > > > Are people still on here? have not seen anything in a while. But if
> > > > there is
> > > > > anyone, I have a question.
> > > > >
> > > > >
> > > >
> > > > ______________________________________________________________
> > > > Laser mailing list
> > > > Home: http://mailman.qth.net/mailman/listinfo/laser
> > > > Help: http://mailman.qth.net/mmfaq.htm
> > > > Post: mailto:Laser at mailman.qth.net
> > > >
> > > > This list hosted by: http://www.qsl.net
> > > > Please help support this email list: http://www.qsl.net/donate.html
> > > >
> > > ______________________________________________________________
> > > Laser mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/laser
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:Laser at mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
> > > ______________________________________________________________
> > > Laser mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/laser
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:Laser at mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
> > >
> > >
> > > ______________________________________________________________
> > > Laser mailing list
> > > Home: http://mailman.qth.net/mailman/listinfo/laser
> > > Help: http://mailman.qth.net/mmfaq.htm
> > > Post: mailto:Laser at mailman.qth.net
> > >
> > > This list hosted by: http://www.qsl.net
> > > Please help support this email list: http://www.qsl.net/donate.html
> > >
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> >
>
>
>
> --
>
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

From n9jim-6 at pacbell.net  Sun May 13 11:34:26 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Sun, 13 May 2018 08:34:26 -0700
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
Message-ID: <70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>

Chuck,

I remember using the cd as grating experiments.

Sin(x) = wavelength / gratings
X is diffraction angle

Increasing the grating from 300 to 1000 decreases sin(x) by 3.3x.
X also decreases.

For the measurement device you read the diffraction offset and distance to the target

Accuracy depends on a few variables.
Increasing the grating density will decrease the angle.
If you kept the same target distance, this increases the sensitivity of measuring the offset.

I?m not sure what you did to decrease the spot size in your instrument, but that also can add error.

See this for a short description.
http://www.nnin.org/sites/default/files/files/Karen_rama_TG_part2_0.pdf

Jim




Sent from my iPad

> On May 12, 2018, at 4:47 PM, Chuck Hast <wchast at gmail.com> wrote:
> 
> Nuu, no paper, just a question. I am building a spectrograph to measure the
> wavelength of lasers I am incorporating into some tools.
> 
> Some years back I built one to determine the wavelength of lasers I was
> using
> in glass container inspectors. The thing was spot on, I checked the device
> using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it was
> well within 5nm of what it should have been.
> 
> I have built one just recently, but I am not getting anywhere near the
> precision
> I was getting with the one back then. I have tested it with one of the DPSS
> lasers I used on the original one. I do not have a HeNe here at this moment
> so not sure where the red end is.
> 
> The  original used a grate at 300 L/mm, figuring on greater accuracy I
> bought
> the 1000 L/mm grate.
> 
> The series of test I have done have given me about 548nm for a 532nm DPSS
> laser, that is way off. The only real difference between the original
> instrument
> and this one is the grating is 1000 L/mm, the original was 300 L/mm. The
> only
> thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but something
> more. I guess I will have to reverse the calculations and see if I can
> determine
> the real number of lines/mm.
> 
> I may also buy a 300 L/mm grate, then I will have it all the same as the
> original.
> 
> 
> Wonder if anyone else has run into this sort of thing.
> 
> 
> 
> On Sat, May 12, 2018 at 11:01 AM, John McNulty <john at generalrobots.com>
> wrote:
> 
>> Greetings All,
>> 
>> Perhaps there?s a learned paper title forthcoming?
>> 
>> "Loop-back Latency in Laser Links" ;-)
>> 
>> Best Wishes to All,
>> 
>> J McN
>> 
>>> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
>>> 
>>> FWIW, the last message I had on this group was August 12, 2016...
>>> 
>>>> On 5/12/2018 7:33 AM, Zack Widup wrote:
>>>> I'm still here. Haven't seen any activity on this group in ages. Go
>> ahead
>>>> with your question!
>>>> 
>>>> 73, Zack W9SZ
>>>> 
>>>> 
>>> 
>>> --
>>> "i" before "e" except after "c", or when sounded as "a" as in neighbor
>> and weigh.
>>> 
>>> This rule is ?counterfeit?. General spelling rules ?forfeit? generality.
>>> They are ?foreign?, being not ?either? or ?neither?, possibly the result
>> of some
>>> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
>> studying,
>>> without ?conscience, inefficient glacier science?. It?s not as
>> nutritious
>>> as "protein". It's just plain old "weird"
>>> 
>>> Is this example ?sufficient??
>>> 
>>> 
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> 
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
> 
> 
> 
> -- 
> 
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

From wchast at gmail.com  Sun May 13 19:39:24 2018
From: wchast at gmail.com (Chuck Hast)
Date: Sun, 13 May 2018 18:39:24 -0500
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
Message-ID: <CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>

Jim,
here are my parameters
Laser is a DPSS 532nm (using it as a reference as this DPSS is always 532nm)

I am using this document as my formula source. I have gone at it using trig
too and it still comes out wrong.

http://laserclassroom.com/products/measure-wavelength-laser-light/

L= Distance grating to the screen with the meter stick on it  =  1000mm
d = line spacing on grating @ 1000/mm = 1/micron
N = Maxima N0 = Maxima #0, N1 = Maxima #1
X = Distance N0 to N1 = 627mm
? = 532nm

The formula I am using is as follows:
?= (X)(d)/L  ?= (627)(0.001)/1000  ?=0.000627 mm or 627 nm which is NOT
532 nm. Either my data is bad OR the line count is bad. I have 10 of these
grating slides (it was cheaper to buy the pack than one) and all of them
give
the same error.  Just for grins I tried 3 different DPSS lasers and of
course
all of them gave the same number.


On Sun, May 13, 2018 at 10:34 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Chuck,
>
> I remember using the cd as grating experiments.
>
> Sin(x) = wavelength / gratings
> X is diffraction angle
>
> Increasing the grating from 300 to 1000 decreases sin(x) by 3.3x.
> X also decreases.
>
> For the measurement device you read the diffraction offset and distance to
> the target
>
> Accuracy depends on a few variables.
> Increasing the grating density will decrease the angle.
> If you kept the same target distance, this increases the sensitivity of
> measuring the offset.
>
> I?m not sure what you did to decrease the spot size in your instrument,
> but that also can add error.
>
> See this for a short description.
> http://www.nnin.org/sites/default/files/files/Karen_rama_TG_part2_0.pdf
>
> Jim
>
>
>
>
> Sent from my iPad
>
> > On May 12, 2018, at 4:47 PM, Chuck Hast <wchast at gmail.com> wrote:
> >
> > Nuu, no paper, just a question. I am building a spectrograph to measure
> the
> > wavelength of lasers I am incorporating into some tools.
> >
> > Some years back I built one to determine the wavelength of lasers I was
> > using
> > in glass container inspectors. The thing was spot on, I checked the
> device
> > using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it was
> > well within 5nm of what it should have been.
> >
> > I have built one just recently, but I am not getting anywhere near the
> > precision
> > I was getting with the one back then. I have tested it with one of the
> DPSS
> > lasers I used on the original one. I do not have a HeNe here at this
> moment
> > so not sure where the red end is.
> >
> > The  original used a grate at 300 L/mm, figuring on greater accuracy I
> > bought
> > the 1000 L/mm grate.
> >
> > The series of test I have done have given me about 548nm for a 532nm DPSS
> > laser, that is way off. The only real difference between the original
> > instrument
> > and this one is the grating is 1000 L/mm, the original was 300 L/mm. The
> > only
> > thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but something
> > more. I guess I will have to reverse the calculations and see if I can
> > determine
> > the real number of lines/mm.
> >
> > I may also buy a 300 L/mm grate, then I will have it all the same as the
> > original.
> >
> >
> > Wonder if anyone else has run into this sort of thing.
> >
> >
> >
> > On Sat, May 12, 2018 at 11:01 AM, John McNulty <john at generalrobots.com>
> > wrote:
> >
> >> Greetings All,
> >>
> >> Perhaps there?s a learned paper title forthcoming?
> >>
> >> "Loop-back Latency in Laser Links" ;-)
> >>
> >> Best Wishes to All,
> >>
> >> J McN
> >>
> >>> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
> >>>
> >>> FWIW, the last message I had on this group was August 12, 2016...
> >>>
> >>>> On 5/12/2018 7:33 AM, Zack Widup wrote:
> >>>> I'm still here. Haven't seen any activity on this group in ages. Go
> >> ahead
> >>>> with your question!
> >>>>
> >>>> 73, Zack W9SZ
> >>>>
> >>>>
> >>>
> >>> --
> >>> "i" before "e" except after "c", or when sounded as "a" as in neighbor
> >> and weigh.
> >>>
> >>> This rule is ?counterfeit?. General spelling rules ?forfeit?
> generality.
> >>> They are ?foreign?, being not ?either? or ?neither?, possibly the
> result
> >> of some
> >>> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
> >> studying,
> >>> without ?conscience, inefficient glacier science?. It?s not as
> >> nutritious
> >>> as "protein". It's just plain old "weird"
> >>>
> >>> Is this example ?sufficient??
> >>>
> >>>
> >>> ______________________________________________________________
> >>> Laser mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>> Help: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:Laser at mailman.qth.net
> >>>
> >>> This list hosted by: http://www.qsl.net
> >>> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >> ______________________________________________________________
> >> Laser mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/laser
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Laser at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> >
> >
> > --
> >
> > Chuck Hast  -- KP4DJT --
> > I can do all things through Christ which strengtheneth me.
> > Ph 4:13 KJV
> > Todo lo puedo en Cristo que me fortalece.
> > Fil 4:13 RVR1960
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From n9jim-6 at pacbell.net  Mon May 14 12:21:05 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Mon, 14 May 2018 09:21:05 -0700
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
	<CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
Message-ID: <BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>

Chuck,
d is the slit width, this is not the same as lines/mm. It is the space between the lines.  The line as are m
Not zero width.
So d will be < 1um.
Since the other parameters are known... d must be 0.848 um

Jim

Sent from my iPad

> On May 13, 2018, at 4:39 PM, Chuck Hast <wchast at gmail.com> wrote:
> 
> Jim,
> here are my parameters
> Laser is a DPSS 532nm (using it as a reference as this DPSS is always 532nm)
> 
> I am using this document as my formula source. I have gone at it using trig
> too and it still comes out wrong.
> 
> http://laserclassroom.com/products/measure-wavelength-laser-light/
> 
> L= Distance grating to the screen with the meter stick on it  =  1000mm
> d = line spacing on grating @ 1000/mm = 1/micron
> N = Maxima N0 = Maxima #0, N1 = Maxima #1
> X = Distance N0 to N1 = 627mm
> ? = 532nm
> 
> The formula I am using is as follows:
> ?= (X)(d)/L  ?= (627)(0.001)/1000  ?=0.000627 mm or 627 nm which is NOT
> 532 nm. Either my data is bad OR the line count is bad. I have 10 of these
> grating slides (it was cheaper to buy the pack than one) and all of them
> give
> the same error.  Just for grins I tried 3 different DPSS lasers and of
> course
> all of them gave the same number.
> 
> 
>> On Sun, May 13, 2018 at 10:34 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>> 
>> Chuck,
>> 
>> I remember using the cd as grating experiments.
>> 
>> Sin(x) = wavelength / gratings
>> X is diffraction angle
>> 
>> Increasing the grating from 300 to 1000 decreases sin(x) by 3.3x.
>> X also decreases.
>> 
>> For the measurement device you read the diffraction offset and distance to
>> the target
>> 
>> Accuracy depends on a few variables.
>> Increasing the grating density will decrease the angle.
>> If you kept the same target distance, this increases the sensitivity of
>> measuring the offset.
>> 
>> I?m not sure what you did to decrease the spot size in your instrument,
>> but that also can add error.
>> 
>> See this for a short description.
>> http://www.nnin.org/sites/default/files/files/Karen_rama_TG_part2_0.pdf
>> 
>> Jim
>> 
>> 
>> 
>> 
>> Sent from my iPad
>> 
>>> On May 12, 2018, at 4:47 PM, Chuck Hast <wchast at gmail.com> wrote:
>>> 
>>> Nuu, no paper, just a question. I am building a spectrograph to measure
>> the
>>> wavelength of lasers I am incorporating into some tools.
>>> 
>>> Some years back I built one to determine the wavelength of lasers I was
>>> using
>>> in glass container inspectors. The thing was spot on, I checked the
>> device
>>> using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it was
>>> well within 5nm of what it should have been.
>>> 
>>> I have built one just recently, but I am not getting anywhere near the
>>> precision
>>> I was getting with the one back then. I have tested it with one of the
>> DPSS
>>> lasers I used on the original one. I do not have a HeNe here at this
>> moment
>>> so not sure where the red end is.
>>> 
>>> The  original used a grate at 300 L/mm, figuring on greater accuracy I
>>> bought
>>> the 1000 L/mm grate.
>>> 
>>> The series of test I have done have given me about 548nm for a 532nm DPSS
>>> laser, that is way off. The only real difference between the original
>>> instrument
>>> and this one is the grating is 1000 L/mm, the original was 300 L/mm. The
>>> only
>>> thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but something
>>> more. I guess I will have to reverse the calculations and see if I can
>>> determine
>>> the real number of lines/mm.
>>> 
>>> I may also buy a 300 L/mm grate, then I will have it all the same as the
>>> original.
>>> 
>>> 
>>> Wonder if anyone else has run into this sort of thing.
>>> 
>>> 
>>> 
>>> On Sat, May 12, 2018 at 11:01 AM, John McNulty <john at generalrobots.com>
>>> wrote:
>>> 
>>>> Greetings All,
>>>> 
>>>> Perhaps there?s a learned paper title forthcoming?
>>>> 
>>>> "Loop-back Latency in Laser Links" ;-)
>>>> 
>>>> Best Wishes to All,
>>>> 
>>>> J McN
>>>> 
>>>>> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
>>>>> 
>>>>> FWIW, the last message I had on this group was August 12, 2016...
>>>>> 
>>>>>> On 5/12/2018 7:33 AM, Zack Widup wrote:
>>>>>> I'm still here. Haven't seen any activity on this group in ages. Go
>>>> ahead
>>>>>> with your question!
>>>>>> 
>>>>>> 73, Zack W9SZ
>>>>>> 
>>>>>> 
>>>>> 
>>>>> --
>>>>> "i" before "e" except after "c", or when sounded as "a" as in neighbor
>>>> and weigh.
>>>>> 
>>>>> This rule is ?counterfeit?. General spelling rules ?forfeit?
>> generality.
>>>>> They are ?foreign?, being not ?either? or ?neither?, possibly the
>> result
>>>> of some
>>>>> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
>>>> studying,
>>>>> without ?conscience, inefficient glacier science?. It?s not as
>>>> nutritious
>>>>> as "protein". It's just plain old "weird"
>>>>> 
>>>>> Is this example ?sufficient??
>>>>> 
>>>>> 
>>>>> ______________________________________________________________
>>>>> Laser mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:Laser at mailman.qth.net
>>>>> 
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> 
>>>> ______________________________________________________________
>>>> Laser mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Laser at mailman.qth.net
>>>> 
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> 
>>> Chuck Hast  -- KP4DJT --
>>> I can do all things through Christ which strengtheneth me.
>>> Ph 4:13 KJV
>>> Todo lo puedo en Cristo que me fortalece.
>>> Fil 4:13 RVR1960
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
> 
> 
> 
> -- 
> 
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From wchast at gmail.com  Mon May 14 18:07:58 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 17:07:58 -0500
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
	<CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
	<BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>
Message-ID: <CADNfBV9Nk0FmxE54_1G_NevPDgc2vWgG8Z0D-f3hcPNyLTmy_Q@mail.gmail.com>

Jim
Oops, yes at 1 um the line would not exist, I was following another
calculation
on the spacing and somehow I did not see where the line width was, the
forumla
gave me 1 um, also gives 3.33 um for the 300 line grate, I had better go
back
and check that.

Thank you,


On Mon, May 14, 2018 at 11:21 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Chuck,
> d is the slit width, this is not the same as lines/mm. It is the space
> between the lines.  The line as are m
> Not zero width.
> So d will be < 1um.
> Since the other parameters are known... d must be 0.848 um
>
> Jim
>
> Sent from my iPad
>
> > On May 13, 2018, at 4:39 PM, Chuck Hast <wchast at gmail.com> wrote:
> >
> > Jim,
> > here are my parameters
> > Laser is a DPSS 532nm (using it as a reference as this DPSS is always
> 532nm)
> >
> > I am using this document as my formula source. I have gone at it using
> trig
> > too and it still comes out wrong.
> >
> > http://laserclassroom.com/products/measure-wavelength-laser-light/
> >
> > L= Distance grating to the screen with the meter stick on it  =  1000mm
> > d = line spacing on grating @ 1000/mm = 1/micron
> > N = Maxima N0 = Maxima #0, N1 = Maxima #1
> > X = Distance N0 to N1 = 627mm
> > ? = 532nm
> >
> > The formula I am using is as follows:
> > ?= (X)(d)/L  ?= (627)(0.001)/1000  ?=0.000627 mm or 627 nm which is NOT
> > 532 nm. Either my data is bad OR the line count is bad. I have 10 of
> these
> > grating slides (it was cheaper to buy the pack than one) and all of them
> > give
> > the same error.  Just for grins I tried 3 different DPSS lasers and of
> > course
> > all of them gave the same number.
> >
> >
> >> On Sun, May 13, 2018 at 10:34 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >>
> >> Chuck,
> >>
> >> I remember using the cd as grating experiments.
> >>
> >> Sin(x) = wavelength / gratings
> >> X is diffraction angle
> >>
> >> Increasing the grating from 300 to 1000 decreases sin(x) by 3.3x.
> >> X also decreases.
> >>
> >> For the measurement device you read the diffraction offset and distance
> to
> >> the target
> >>
> >> Accuracy depends on a few variables.
> >> Increasing the grating density will decrease the angle.
> >> If you kept the same target distance, this increases the sensitivity of
> >> measuring the offset.
> >>
> >> I?m not sure what you did to decrease the spot size in your instrument,
> >> but that also can add error.
> >>
> >> See this for a short description.
> >> http://www.nnin.org/sites/default/files/files/Karen_rama_TG_part2_0.pdf
> >>
> >> Jim
> >>
> >>
> >>
> >>
> >> Sent from my iPad
> >>
> >>> On May 12, 2018, at 4:47 PM, Chuck Hast <wchast at gmail.com> wrote:
> >>>
> >>> Nuu, no paper, just a question. I am building a spectrograph to measure
> >> the
> >>> wavelength of lasers I am incorporating into some tools.
> >>>
> >>> Some years back I built one to determine the wavelength of lasers I was
> >>> using
> >>> in glass container inspectors. The thing was spot on, I checked the
> >> device
> >>> using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it
> was
> >>> well within 5nm of what it should have been.
> >>>
> >>> I have built one just recently, but I am not getting anywhere near the
> >>> precision
> >>> I was getting with the one back then. I have tested it with one of the
> >> DPSS
> >>> lasers I used on the original one. I do not have a HeNe here at this
> >> moment
> >>> so not sure where the red end is.
> >>>
> >>> The  original used a grate at 300 L/mm, figuring on greater accuracy I
> >>> bought
> >>> the 1000 L/mm grate.
> >>>
> >>> The series of test I have done have given me about 548nm for a 532nm
> DPSS
> >>> laser, that is way off. The only real difference between the original
> >>> instrument
> >>> and this one is the grating is 1000 L/mm, the original was 300 L/mm.
> The
> >>> only
> >>> thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but
> something
> >>> more. I guess I will have to reverse the calculations and see if I can
> >>> determine
> >>> the real number of lines/mm.
> >>>
> >>> I may also buy a 300 L/mm grate, then I will have it all the same as
> the
> >>> original.
> >>>
> >>>
> >>> Wonder if anyone else has run into this sort of thing.
> >>>
> >>>
> >>>
> >>> On Sat, May 12, 2018 at 11:01 AM, John McNulty <john at generalrobots.com
> >
> >>> wrote:
> >>>
> >>>> Greetings All,
> >>>>
> >>>> Perhaps there?s a learned paper title forthcoming?
> >>>>
> >>>> "Loop-back Latency in Laser Links" ;-)
> >>>>
> >>>> Best Wishes to All,
> >>>>
> >>>> J McN
> >>>>
> >>>>> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
> >>>>>
> >>>>> FWIW, the last message I had on this group was August 12, 2016...
> >>>>>
> >>>>>> On 5/12/2018 7:33 AM, Zack Widup wrote:
> >>>>>> I'm still here. Haven't seen any activity on this group in ages. Go
> >>>> ahead
> >>>>>> with your question!
> >>>>>>
> >>>>>> 73, Zack W9SZ
> >>>>>>
> >>>>>>
> >>>>>
> >>>>> --
> >>>>> "i" before "e" except after "c", or when sounded as "a" as in
> neighbor
> >>>> and weigh.
> >>>>>
> >>>>> This rule is ?counterfeit?. General spelling rules ?forfeit?
> >> generality.
> >>>>> They are ?foreign?, being not ?either? or ?neither?, possibly the
> >> result
> >>>> of some
> >>>>> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
> >>>> studying,
> >>>>> without ?conscience, inefficient glacier science?. It?s not as
> >>>> nutritious
> >>>>> as "protein". It's just plain old "weird"
> >>>>>
> >>>>> Is this example ?sufficient??
> >>>>>
> >>>>>
> >>>>> ______________________________________________________________
> >>>>> Laser mailing list
> >>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>>>> Help: http://mailman.qth.net/mmfaq.htm
> >>>>> Post: mailto:Laser at mailman.qth.net
> >>>>>
> >>>>> This list hosted by: http://www.qsl.net
> >>>>> Please help support this email list: http://www.qsl.net/donate.html
> >>>>
> >>>> ______________________________________________________________
> >>>> Laser mailing list
> >>>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>>> Help: http://mailman.qth.net/mmfaq.htm
> >>>> Post: mailto:Laser at mailman.qth.net
> >>>>
> >>>> This list hosted by: http://www.qsl.net
> >>>> Please help support this email list: http://www.qsl.net/donate.html
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Chuck Hast  -- KP4DJT --
> >>> I can do all things through Christ which strengtheneth me.
> >>> Ph 4:13 KJV
> >>> Todo lo puedo en Cristo que me fortalece.
> >>> Fil 4:13 RVR1960
> >>> ______________________________________________________________
> >>> Laser mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>> Help: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:Laser at mailman.qth.net
> >>>
> >>> This list hosted by: http://www.qsl.net
> >>> Please help support this email list: http://www.qsl.net/donate.html
> >> ______________________________________________________________
> >> Laser mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/laser
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Laser at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> >
> >
> > --
> >
> > Chuck Hast  -- KP4DJT --
> > I can do all things through Christ which strengtheneth me.
> > Ph 4:13 KJV
> > Todo lo puedo en Cristo que me fortalece.
> > Fil 4:13 RVR1960
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From wchast at gmail.com  Mon May 14 19:30:15 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 18:30:15 -0500
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <CADNfBV9Nk0FmxE54_1G_NevPDgc2vWgG8Z0D-f3hcPNyLTmy_Q@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
	<CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
	<BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>
	<CADNfBV9Nk0FmxE54_1G_NevPDgc2vWgG8Z0D-f3hcPNyLTmy_Q@mail.gmail.com>
Message-ID: <CADNfBV_8HyF4p_TYRL2XNpX25MtD5iiOpoxiaAeRyj-z4Pjf7A@mail.gmail.com>

That did it. I went back through and all of the indications I had on
different
documents do a calculation to figure out the distance between lines but the
lines are ZERO width, now that I look at it. That cannot be, or I am missing
something.

Take a look at the UCLA video here, I do not see where he takes into account
line width just spacing from center of line to center of line.

https://www.youtube.com/watch?v=E-3uht9LAhM

Several others have given the same calculation, I end up at the same thing
Spacing = 1 um, so the line is infinitely small based on that. Of course we
know
it is not.


On Mon, May 14, 2018 at 5:07 PM, Chuck Hast <wchast at gmail.com> wrote:

> Jim
> Oops, yes at 1 um the line would not exist, I was following another
> calculation
> on the spacing and somehow I did not see where the line width was, the
> forumla
> gave me 1 um, also gives 3.33 um for the 300 line grate, I had better go
> back
> and check that.
>
> Thank you,
>
>
> On Mon, May 14, 2018 at 11:21 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>
>> Chuck,
>> d is the slit width, this is not the same as lines/mm. It is the space
>> between the lines.  The line as are m
>> Not zero width.
>> So d will be < 1um.
>> Since the other parameters are known... d must be 0.848 um
>>
>> Jim
>>
>> Sent from my iPad
>>
>> > On May 13, 2018, at 4:39 PM, Chuck Hast <wchast at gmail.com> wrote:
>> >
>> > Jim,
>> > here are my parameters
>> > Laser is a DPSS 532nm (using it as a reference as this DPSS is always
>> 532nm)
>> >
>> > I am using this document as my formula source. I have gone at it using
>> trig
>> > too and it still comes out wrong.
>> >
>> > http://laserclassroom.com/products/measure-wavelength-laser-light/
>> >
>> > L= Distance grating to the screen with the meter stick on it  =  1000mm
>> > d = line spacing on grating @ 1000/mm = 1/micron
>> > N = Maxima N0 = Maxima #0, N1 = Maxima #1
>> > X = Distance N0 to N1 = 627mm
>> > ? = 532nm
>> >
>> > The formula I am using is as follows:
>> > ?= (X)(d)/L  ?= (627)(0.001)/1000  ?=0.000627 mm or 627 nm which is NOT
>> > 532 nm. Either my data is bad OR the line count is bad. I have 10 of
>> these
>> > grating slides (it was cheaper to buy the pack than one) and all of them
>> > give
>> > the same error.  Just for grins I tried 3 different DPSS lasers and of
>> > course
>> > all of them gave the same number.
>> >
>> >
>> >> On Sun, May 13, 2018 at 10:34 AM, Jim Moss <n9jim-6 at pacbell.net>
>> wrote:
>> >>
>> >> Chuck,
>> >>
>> >> I remember using the cd as grating experiments.
>> >>
>> >> Sin(x) = wavelength / gratings
>> >> X is diffraction angle
>> >>
>> >> Increasing the grating from 300 to 1000 decreases sin(x) by 3.3x.
>> >> X also decreases.
>> >>
>> >> For the measurement device you read the diffraction offset and
>> distance to
>> >> the target
>> >>
>> >> Accuracy depends on a few variables.
>> >> Increasing the grating density will decrease the angle.
>> >> If you kept the same target distance, this increases the sensitivity of
>> >> measuring the offset.
>> >>
>> >> I?m not sure what you did to decrease the spot size in your instrument,
>> >> but that also can add error.
>> >>
>> >> See this for a short description.
>> >> http://www.nnin.org/sites/default/files/files/Karen_rama_TG_
>> part2_0.pdf
>> >>
>> >> Jim
>> >>
>> >>
>> >>
>> >>
>> >> Sent from my iPad
>> >>
>> >>> On May 12, 2018, at 4:47 PM, Chuck Hast <wchast at gmail.com> wrote:
>> >>>
>> >>> Nuu, no paper, just a question. I am building a spectrograph to
>> measure
>> >> the
>> >>> wavelength of lasers I am incorporating into some tools.
>> >>>
>> >>> Some years back I built one to determine the wavelength of lasers I
>> was
>> >>> using
>> >>> in glass container inspectors. The thing was spot on, I checked the
>> >> device
>> >>> using a DPSS laser at 532nm, and a HeNe at 632.8nm. In both cases it
>> was
>> >>> well within 5nm of what it should have been.
>> >>>
>> >>> I have built one just recently, but I am not getting anywhere near the
>> >>> precision
>> >>> I was getting with the one back then. I have tested it with one of the
>> >> DPSS
>> >>> lasers I used on the original one. I do not have a HeNe here at this
>> >> moment
>> >>> so not sure where the red end is.
>> >>>
>> >>> The  original used a grate at 300 L/mm, figuring on greater accuracy I
>> >>> bought
>> >>> the 1000 L/mm grate.
>> >>>
>> >>> The series of test I have done have given me about 548nm for a 532nm
>> DPSS
>> >>> laser, that is way off. The only real difference between the original
>> >>> instrument
>> >>> and this one is the grating is 1000 L/mm, the original was 300 L/mm.
>> The
>> >>> only
>> >>> thing that I can suspect is the 1000 L/mm is NOT 1000 L/mm but
>> something
>> >>> more. I guess I will have to reverse the calculations and see if I can
>> >>> determine
>> >>> the real number of lines/mm.
>> >>>
>> >>> I may also buy a 300 L/mm grate, then I will have it all the same as
>> the
>> >>> original.
>> >>>
>> >>>
>> >>> Wonder if anyone else has run into this sort of thing.
>> >>>
>> >>>
>> >>>
>> >>> On Sat, May 12, 2018 at 11:01 AM, John McNulty <
>> john at generalrobots.com>
>> >>> wrote:
>> >>>
>> >>>> Greetings All,
>> >>>>
>> >>>> Perhaps there?s a learned paper title forthcoming?
>> >>>>
>> >>>> "Loop-back Latency in Laser Links" ;-)
>> >>>>
>> >>>> Best Wishes to All,
>> >>>>
>> >>>> J McN
>> >>>>
>> >>>>> On 12 May 2018, at 15:48, Glenn Thomas <glennt at gbis.com> wrote:
>> >>>>>
>> >>>>> FWIW, the last message I had on this group was August 12, 2016...
>> >>>>>
>> >>>>>> On 5/12/2018 7:33 AM, Zack Widup wrote:
>> >>>>>> I'm still here. Haven't seen any activity on this group in ages. Go
>> >>>> ahead
>> >>>>>> with your question!
>> >>>>>>
>> >>>>>> 73, Zack W9SZ
>> >>>>>>
>> >>>>>>
>> >>>>>
>> >>>>> --
>> >>>>> "i" before "e" except after "c", or when sounded as "a" as in
>> neighbor
>> >>>> and weigh.
>> >>>>>
>> >>>>> This rule is ?counterfeit?. General spelling rules ?forfeit?
>> >> generality.
>> >>>>> They are ?foreign?, being not ?either? or ?neither?, possibly the
>> >> result
>> >>>> of some
>> >>>>> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
>> >>>> studying,
>> >>>>> without ?conscience, inefficient glacier science?. It?s not as
>> >>>> nutritious
>> >>>>> as "protein". It's just plain old "weird"
>> >>>>>
>> >>>>> Is this example ?sufficient??
>> >>>>>
>> >>>>>
>> >>>>> ______________________________________________________________
>> >>>>> Laser mailing list
>> >>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> >>>>> Help: http://mailman.qth.net/mmfaq.htm
>> >>>>> Post: mailto:Laser at mailman.qth.net
>> >>>>>
>> >>>>> This list hosted by: http://www.qsl.net
>> >>>>> Please help support this email list: http://www.qsl.net/donate.html
>> >>>>
>> >>>> ______________________________________________________________
>> >>>> Laser mailing list
>> >>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> >>>> Help: http://mailman.qth.net/mmfaq.htm
>> >>>> Post: mailto:Laser at mailman.qth.net
>> >>>>
>> >>>> This list hosted by: http://www.qsl.net
>> >>>> Please help support this email list: http://www.qsl.net/donate.html
>> >>>>
>> >>>
>> >>>
>> >>>
>> >>> --
>> >>>
>> >>> Chuck Hast  -- KP4DJT --
>> >>> I can do all things through Christ which strengtheneth me.
>> >>> Ph 4:13 KJV
>> >>> Todo lo puedo en Cristo que me fortalece.
>> >>> Fil 4:13 RVR1960
>> >>> ______________________________________________________________
>> >>> Laser mailing list
>> >>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> >>> Help: http://mailman.qth.net/mmfaq.htm
>> >>> Post: mailto:Laser at mailman.qth.net
>> >>>
>> >>> This list hosted by: http://www.qsl.net
>> >>> Please help support this email list: http://www.qsl.net/donate.html
>> >> ______________________________________________________________
>> >> Laser mailing list
>> >> Home: http://mailman.qth.net/mailman/listinfo/laser
>> >> Help: http://mailman.qth.net/mmfaq.htm
>> >> Post: mailto:Laser at mailman.qth.net
>> >>
>> >> This list hosted by: http://www.qsl.net
>> >> Please help support this email list: http://www.qsl.net/donate.html
>> >>
>> >
>> >
>> >
>> > --
>> >
>> > Chuck Hast  -- KP4DJT --
>> > I can do all things through Christ which strengtheneth me.
>> > Ph 4:13 KJV
>> > Todo lo puedo en Cristo que me fortalece.
>> > Fil 4:13 RVR1960
>> > ______________________________________________________________
>> > Laser mailing list
>> > Home: http://mailman.qth.net/mailman/listinfo/laser
>> > Help: http://mailman.qth.net/mmfaq.htm
>> > Post: mailto:Laser at mailman.qth.net
>> >
>> > This list hosted by: http://www.qsl.net
>> > Please help support this email list: http://www.qsl.net/donate.html
>>
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
>
> --
>
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
>
>


-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From glennt at gbis.com  Mon May 14 19:54:25 2018
From: glennt at gbis.com (Glenn Thomas)
Date: Mon, 14 May 2018 16:54:25 -0700
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <CADNfBV_8HyF4p_TYRL2XNpX25MtD5iiOpoxiaAeRyj-z4Pjf7A@mail.gmail.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
	<CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
	<BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>
	<CADNfBV9Nk0FmxE54_1G_NevPDgc2vWgG8Z0D-f3hcPNyLTmy_Q@mail.gmail.com>
	<CADNfBV_8HyF4p_TYRL2XNpX25MtD5iiOpoxiaAeRyj-z4Pjf7A@mail.gmail.com>
Message-ID: <c18f758d-5dfe-0af1-04f6-272a91c0d8c4@gbis.com>

Just a lurkers thought...

The spectrum line from a coherent monochromatic source should be zero
width. It's not quite because of thermal doppler in the individual
emitting atoms in the source. Other than that spreading, monochromatic
should be zero width and any width that is observed (other than thermal
doppler) should be an artifact of the instrument.

So, what kind of width did you observe?

73 de Glenn wb6w
(back into lurk mode...)

On 5/14/2018 4:30 PM, Chuck Hast wrote:
> That did it. I went back through and all of the indications I had on
> different
> documents do a calculation to figure out the distance between lines but the
> lines are ZERO width, now that I look at it. That cannot be, or I am missing
> something.
>
> Take a look at the UCLA video here, I do not see where he takes into account
> line width just spacing from center of line to center of line.
>
> https://www.youtube.com/watch?v=E-3uht9LAhM
>
> Several others have given the same calculation, I end up at the same thing
> Spacing = 1 um, so the line is infinitely small based on that. Of course we
> know
> it is not.
>
>

-- 
"i" before "e" except after "c", or when sounded as "a" as in neighbor and weigh.

This rule is ?counterfeit?. General spelling rules ?forfeit? generality. 
They are ?foreign?, being not ?either? or ?neither?, possibly the result of some 
?leisure? activity of a ?sovereign heir? who, lacking ?height?, is studying, 
without ?conscience, inefficient glacier science?. It?s not as nutritious 
as "protein". It's just plain old "weird"

Is this example ?sufficient??



From n9jim-6 at pacbell.net  Mon May 14 20:40:29 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Mon, 14 May 2018 17:40:29 -0700
Subject: [Laser] Chucks question continued
Message-ID: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>

Chuck,

After rereading, I think my statement on d is not correct. It may be as simple as 1 mm/1000. See link below to Newport.

Could the error be related to that you are not reflecting directly off the grating surface? The experiment shows sending the beam thru the grating? If so, could there be an angle error induced?

 Could it be that the grating is facing the wrong way? Thus creating an offset due to the medium thickness of the grating material?

Good summary on defraction gratings.
https://www.newport.com/t/grating-physics

Jim


Sent from my iPad

From wchast at gmail.com  Mon May 14 20:56:56 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 19:56:56 -0500
Subject: [Laser] last message was 8/12/2016?
In-Reply-To: <c18f758d-5dfe-0af1-04f6-272a91c0d8c4@gbis.com>
References: <CADNfBV8+=PLXFc29+BiEd1v_4PsZJkSkDtwbgpVmvBZ9-dyLgw@mail.gmail.com>
	<CANJxhWjF7u0w+QDOLfj3cW+jNWpC7E1NjM7U=SJHbVPu9BnroA@mail.gmail.com>
	<f6a66745-441b-e5d4-3ef6-5e56b71ed693@gbis.com>
	<A6509B85-34AC-4C13-9843-2C0EA103C763@generalrobots.com>
	<CADNfBV9RMM1TEin8AuumMy9+dxaOdUwvC+irAZj0K49HEoc3gQ@mail.gmail.com>
	<70028543-3EC4-4D16-BED2-36A10E441B5A@pacbell.net>
	<CADNfBV8dACpmX_4jUb_1A6LKE3nP15ho_RXS9WOFia8QG_woeQ@mail.gmail.com>
	<BA8D6952-6A4F-4E21-B8A0-0AED40B55FAF@pacbell.net>
	<CADNfBV9Nk0FmxE54_1G_NevPDgc2vWgG8Z0D-f3hcPNyLTmy_Q@mail.gmail.com>
	<CADNfBV_8HyF4p_TYRL2XNpX25MtD5iiOpoxiaAeRyj-z4Pjf7A@mail.gmail.com>
	<c18f758d-5dfe-0af1-04f6-272a91c0d8c4@gbis.com>
Message-ID: <CADNfBV8LDFR-BLciy+geBM-kWoM5aFNY7hfBRqqCOo+6WYG2qg@mail.gmail.com>

Glenn
We are discussing the grating used to refract a laser beam in order to in
this case measure the wave length. When I run the formula to do the
calculation, I ended up off, and due to the fact that the formula does not
appear to take into account the width of the lines which function to form
the grate that is doing the refraction.  Jim determined that each line was
about 152 nm so the distance from line center is 1 um but the spacing is
848 nm. With that value my calculations came out as they should. Now I
have to figure the width of the grating lines on other grating so that my
numbers come out good.

A fun exercise in working with lasers and obtaining the solutions I needed.



On Mon, May 14, 2018 at 6:54 PM, Glenn Thomas <glennt at gbis.com> wrote:

> Just a lurkers thought...
>
> The spectrum line from a coherent monochromatic source should be zero
> width. It's not quite because of thermal doppler in the individual
> emitting atoms in the source. Other than that spreading, monochromatic
> should be zero width and any width that is observed (other than thermal
> doppler) should be an artifact of the instrument.
>
> So, what kind of width did you observe?
>
> 73 de Glenn wb6w
> (back into lurk mode...)
>
> On 5/14/2018 4:30 PM, Chuck Hast wrote:
> > That did it. I went back through and all of the indications I had on
> > different
> > documents do a calculation to figure out the distance between lines but
> the
> > lines are ZERO width, now that I look at it. That cannot be, or I am
> missing
> > something.
> >
> > Take a look at the UCLA video here, I do not see where he takes into
> account
> > line width just spacing from center of line to center of line.
> >
> > https://www.youtube.com/watch?v=E-3uht9LAhM
> >
> > Several others have given the same calculation, I end up at the same
> thing
> > Spacing = 1 um, so the line is infinitely small based on that. Of course
> we
> > know
> > it is not.
> >
> >
>
> --
> "i" before "e" except after "c", or when sounded as "a" as in neighbor and
> weigh.
>
> This rule is ?counterfeit?. General spelling rules ?forfeit? generality.
> They are ?foreign?, being not ?either? or ?neither?, possibly the result
> of some
> ?leisure? activity of a ?sovereign heir? who, lacking ?height?, is
> studying,
> without ?conscience, inefficient glacier science?. It?s not as nutritious
> as "protein". It's just plain old "weird"
>
> Is this example ?sufficient??
>
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From wchast at gmail.com  Mon May 14 21:04:57 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 20:04:57 -0500
Subject: [Laser] Chucks question continued
In-Reply-To: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
Message-ID: <CADNfBV9xieB492=338+v4paWP5bRaYmTNc20saSvk-womX-SzQ@mail.gmail.com>

Jim,
When I plugged in your number I got 532 (it was a rather long decimal but
for
effects of calculation it gave 532 nm)

I am using a grating slide, the laser sends a beam through the slide the
grating
generates the two side beams at the two maxima either side of maxima 0.

Yes there are reflective ones, but I am using the transmissive slide as
shown
in the following instruction:

http://laserclassroom.com/products/measure-wavelength-laser-light/

I did this sort of thing back about 4 years ago, I got a good formula and
was able to obtain very good results. I had it in a spread sheet, I thought
I had saved it on a disk but appears it did not get saved.

I know this all works just have to sort it out.

On Mon, May 14, 2018 at 7:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Chuck,
>
> After rereading, I think my statement on d is not correct. It may be as
> simple as 1 mm/1000. See link below to Newport.
>
> Could the error be related to that you are not reflecting directly off the
> grating surface? The experiment shows sending the beam thru the grating? If
> so, could there be an angle error induced?
>
>  Could it be that the grating is facing the wrong way? Thus creating an
> offset due to the medium thickness of the grating material?
>
> Good summary on defraction gratings.
> https://www.newport.com/t/grating-physics
>
> Jim
>
>
> Sent from my iPad
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From wchast at gmail.com  Mon May 14 21:19:27 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 20:19:27 -0500
Subject: [Laser] Chucks question continued
In-Reply-To: <CADNfBV9xieB492=338+v4paWP5bRaYmTNc20saSvk-womX-SzQ@mail.gmail.com>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<CADNfBV9xieB492=338+v4paWP5bRaYmTNc20saSvk-womX-SzQ@mail.gmail.com>
Message-ID: <CADNfBV-e2DkEzM8=2db0PQAjyQte3rvgmuq79wbeRM+30GbDag@mail.gmail.com>

I just put a 650nm laser in the spectrograph and it gave me a reading of
704 nm. So it is off. Will continue to look at it. I know it works just
have to
figure out what is going on.

On Mon, May 14, 2018 at 8:04 PM, Chuck Hast <wchast at gmail.com> wrote:

> Jim,
> When I plugged in your number I got 532 (it was a rather long decimal but
> for
> effects of calculation it gave 532 nm)
>
> I am using a grating slide, the laser sends a beam through the slide the
> grating
> generates the two side beams at the two maxima either side of maxima 0.
>
> Yes there are reflective ones, but I am using the transmissive slide as
> shown
> in the following instruction:
>
> http://laserclassroom.com/products/measure-wavelength-laser-light/
>
> I did this sort of thing back about 4 years ago, I got a good formula and
> was able to obtain very good results. I had it in a spread sheet, I thought
> I had saved it on a disk but appears it did not get saved.
>
> I know this all works just have to sort it out.
>
> On Mon, May 14, 2018 at 7:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>
>> Chuck,
>>
>> After rereading, I think my statement on d is not correct. It may be as
>> simple as 1 mm/1000. See link below to Newport.
>>
>> Could the error be related to that you are not reflecting directly off
>> the grating surface? The experiment shows sending the beam thru the
>> grating? If so, could there be an angle error induced?
>>
>>  Could it be that the grating is facing the wrong way? Thus creating an
>> offset due to the medium thickness of the grating material?
>>
>> Good summary on defraction gratings.
>> https://www.newport.com/t/grating-physics
>>
>> Jim
>>
>>
>> Sent from my iPad
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
>
> --
>
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
>
>


-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From n9jim-6 at pacbell.net  Mon May 14 21:21:12 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Mon, 14 May 2018 18:21:12 -0700
Subject: [Laser] Chucks question continued
In-Reply-To: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
Message-ID: <32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>

Chuck,
It looks like we may have sin and tan issues here

Original cited article:
http://laserclassroom.com/products/measure-wavelength-laser-light/

The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
That?s diffraction distance (X) / distance to target (L)

The grating equation is WL = d sin(32.08771207), d=1000/mm
Or 531.2 nM.  That matches your laser source.

Note that in your original cited article approximates sin = tan. 
This is true when the angle is small, but introduces errors at larger angles.

Here?s a calculator for the experiment: not using the approximation.
http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html

Jim

Sent from my iPad

> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> 
> Chuck,
> 
> After rereading, I think my statement on d is not correct. It may be as simple as 1 mm/1000. See link below to Newport.
> 
> Could the error be related to that you are not reflecting directly off the grating surface? The experiment shows sending the beam thru the grating? If so, could there be an angle error induced?
> 
> Could it be that the grating is facing the wrong way? Thus creating an offset due to the medium thickness of the grating material?
> 
> Good summary on defraction gratings.
> https://www.newport.com/t/grating-physics
> 
> Jim
> 
> 
> Sent from my iPad
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html

From wchast at gmail.com  Mon May 14 23:08:40 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 22:08:40 -0500
Subject: [Laser] Chucks question continued
In-Reply-To: <32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
Message-ID: <CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>

Jim,
That did it. Now to go through it and get it into a stand alone little
piece of
say python code. A good exercise for me...

Then the larger angle was probably what was taking a bite out the numbers in
the original calculation using the formula that you indicated was doing the
approximation.


On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Chuck,
> It looks like we may have sin and tan issues here
>
> Original cited article:
> http://laserclassroom.com/products/measure-wavelength-laser-light/
>
> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
> That?s diffraction distance (X) / distance to target (L)
>
> The grating equation is WL = d sin(32.08771207), d=1000/mm
> Or 531.2 nM.  That matches your laser source.
>
> Note that in your original cited article approximates sin = tan.
> This is true when the angle is small, but introduces errors at larger
> angles.
>
> Here?s a calculator for the experiment: not using the approximation.
> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
>
> Jim
>
> Sent from my iPad
>
> > On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >
> > Chuck,
> >
> > After rereading, I think my statement on d is not correct. It may be as
> simple as 1 mm/1000. See link below to Newport.
> >
> > Could the error be related to that you are not reflecting directly off
> the grating surface? The experiment shows sending the beam thru the
> grating? If so, could there be an angle error induced?
> >
> > Could it be that the grating is facing the wrong way? Thus creating an
> offset due to the medium thickness of the grating material?
> >
> > Good summary on defraction gratings.
> > https://www.newport.com/t/grating-physics
> >
> > Jim
> >
> >
> > Sent from my iPad
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From n9jim-6 at pacbell.net  Tue May 15 00:32:24 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Mon, 14 May 2018 21:32:24 -0700
Subject: [Laser] Chucks question continued
In-Reply-To: <CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
	<CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
Message-ID: <1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>

Mike,
Looks like that is pretty cheap.
Looks like it is about 3nm resolution, and about 2 month delay to shipment.
You have to calibrate it yourself.
Might be interesting.  
Let us know how it goes.
Jim


Sent from my iPad

> On May 14, 2018, at 8:08 PM, Chuck Hast <wchast at gmail.com> wrote:
> 
> Jim,
> That did it. Now to go through it and get it into a stand alone little
> piece of
> say python code. A good exercise for me...
> 
> Then the larger angle was probably what was taking a bite out the numbers in
> the original calculation using the formula that you indicated was doing the
> approximation.
> 
> 
>> On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>> 
>> Chuck,
>> It looks like we may have sin and tan issues here
>> 
>> Original cited article:
>> http://laserclassroom.com/products/measure-wavelength-laser-light/
>> 
>> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
>> That?s diffraction distance (X) / distance to target (L)
>> 
>> The grating equation is WL = d sin(32.08771207), d=1000/mm
>> Or 531.2 nM.  That matches your laser source.
>> 
>> Note that in your original cited article approximates sin = tan.
>> This is true when the angle is small, but introduces errors at larger
>> angles.
>> 
>> Here?s a calculator for the experiment: not using the approximation.
>> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
>> 
>> Jim
>> 
>> Sent from my iPad
>> 
>>> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>>> 
>>> Chuck,
>>> 
>>> After rereading, I think my statement on d is not correct. It may be as
>> simple as 1 mm/1000. See link below to Newport.
>>> 
>>> Could the error be related to that you are not reflecting directly off
>> the grating surface? The experiment shows sending the beam thru the
>> grating? If so, could there be an angle error induced?
>>> 
>>> Could it be that the grating is facing the wrong way? Thus creating an
>> offset due to the medium thickness of the grating material?
>>> 
>>> Good summary on defraction gratings.
>>> https://www.newport.com/t/grating-physics
>>> 
>>> Jim
>>> 
>>> 
>>> Sent from my iPad
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
> 
> 
> 
> -- 
> 
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From wchast at gmail.com  Tue May 15 00:44:16 2018
From: wchast at gmail.com (Chuck Hast)
Date: Mon, 14 May 2018 23:44:16 -0500
Subject: [Laser] Chucks question continued
In-Reply-To: <1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
	<CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
	<1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>
Message-ID: <CADNfBV_vZnPgaO=6EjoN75s_5kxd-BG+-heQO2YhicXmjtV7eg@mail.gmail.com>

Jim,
Looks like I missed something did not see anything from Mike just saw
your response. Is it some sort of spectrograph or spectrometer?


On Mon, May 14, 2018 at 11:32 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Mike,
> Looks like that is pretty cheap.
> Looks like it is about 3nm resolution, and about 2 month delay to shipment.
> You have to calibrate it yourself.
> Might be interesting.
> Let us know how it goes.
> Jim
>
>
> Sent from my iPad
>
> > On May 14, 2018, at 8:08 PM, Chuck Hast <wchast at gmail.com> wrote:
> >
> > Jim,
> > That did it. Now to go through it and get it into a stand alone little
> > piece of
> > say python code. A good exercise for me...
> >
> > Then the larger angle was probably what was taking a bite out the
> numbers in
> > the original calculation using the formula that you indicated was doing
> the
> > approximation.
> >
> >
> >> On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >>
> >> Chuck,
> >> It looks like we may have sin and tan issues here
> >>
> >> Original cited article:
> >> http://laserclassroom.com/products/measure-wavelength-laser-light/
> >>
> >> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
> >> That?s diffraction distance (X) / distance to target (L)
> >>
> >> The grating equation is WL = d sin(32.08771207), d=1000/mm
> >> Or 531.2 nM.  That matches your laser source.
> >>
> >> Note that in your original cited article approximates sin = tan.
> >> This is true when the angle is small, but introduces errors at larger
> >> angles.
> >>
> >> Here?s a calculator for the experiment: not using the approximation.
> >> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
> >>
> >> Jim
> >>
> >> Sent from my iPad
> >>
> >>> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >>>
> >>> Chuck,
> >>>
> >>> After rereading, I think my statement on d is not correct. It may be as
> >> simple as 1 mm/1000. See link below to Newport.
> >>>
> >>> Could the error be related to that you are not reflecting directly off
> >> the grating surface? The experiment shows sending the beam thru the
> >> grating? If so, could there be an angle error induced?
> >>>
> >>> Could it be that the grating is facing the wrong way? Thus creating an
> >> offset due to the medium thickness of the grating material?
> >>>
> >>> Good summary on defraction gratings.
> >>> https://www.newport.com/t/grating-physics
> >>>
> >>> Jim
> >>>
> >>>
> >>> Sent from my iPad
> >>> ______________________________________________________________
> >>> Laser mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>> Help: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:Laser at mailman.qth.net
> >>>
> >>> This list hosted by: http://www.qsl.net
> >>> Please help support this email list: http://www.qsl.net/donate.html
> >> ______________________________________________________________
> >> Laser mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/laser
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Laser at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> >
> >
> > --
> >
> > Chuck Hast  -- KP4DJT --
> > I can do all things through Christ which strengtheneth me.
> > Ph 4:13 KJV
> > Todo lo puedo en Cristo que me fortalece.
> > Fil 4:13 RVR1960
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From n9jim-6 at pacbell.net  Tue May 15 10:06:39 2018
From: n9jim-6 at pacbell.net (Jim Moss)
Date: Tue, 15 May 2018 07:06:39 -0700
Subject: [Laser] Chucks question continued
In-Reply-To: <CADNfBV_vZnPgaO=6EjoN75s_5kxd-BG+-heQO2YhicXmjtV7eg@mail.gmail.com>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
	<CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
	<1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>
	<CADNfBV_vZnPgaO=6EjoN75s_5kxd-BG+-heQO2YhicXmjtV7eg@mail.gmail.com>
Message-ID: <9A4C5DDC-5128-4F32-8074-31FA97066E31@pacbell.net>

Mike found a spectrometer on eBay. 
New they are about $150, and there is a $70 model as well. From a French company Thunder Optics.
Jim

Sent from my iPhone

> On May 14, 2018, at 9:44 PM, Chuck Hast <wchast at gmail.com> wrote:
> 
> Jim,
> Looks like I missed something did not see anything from Mike just saw
> your response. Is it some sort of spectrograph or spectrometer?
> 
> 
>> On Mon, May 14, 2018 at 11:32 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>> 
>> Mike,
>> Looks like that is pretty cheap.
>> Looks like it is about 3nm resolution, and about 2 month delay to shipment.
>> You have to calibrate it yourself.
>> Might be interesting.
>> Let us know how it goes.
>> Jim
>> 
>> 
>> Sent from my iPad
>> 
>>> On May 14, 2018, at 8:08 PM, Chuck Hast <wchast at gmail.com> wrote:
>>> 
>>> Jim,
>>> That did it. Now to go through it and get it into a stand alone little
>>> piece of
>>> say python code. A good exercise for me...
>>> 
>>> Then the larger angle was probably what was taking a bite out the
>> numbers in
>>> the original calculation using the formula that you indicated was doing
>> the
>>> approximation.
>>> 
>>> 
>>>> On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>>>> 
>>>> Chuck,
>>>> It looks like we may have sin and tan issues here
>>>> 
>>>> Original cited article:
>>>> http://laserclassroom.com/products/measure-wavelength-laser-light/
>>>> 
>>>> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
>>>> That?s diffraction distance (X) / distance to target (L)
>>>> 
>>>> The grating equation is WL = d sin(32.08771207), d=1000/mm
>>>> Or 531.2 nM.  That matches your laser source.
>>>> 
>>>> Note that in your original cited article approximates sin = tan.
>>>> This is true when the angle is small, but introduces errors at larger
>>>> angles.
>>>> 
>>>> Here?s a calculator for the experiment: not using the approximation.
>>>> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
>>>> 
>>>> Jim
>>>> 
>>>> Sent from my iPad
>>>> 
>>>>> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>>>>> 
>>>>> Chuck,
>>>>> 
>>>>> After rereading, I think my statement on d is not correct. It may be as
>>>> simple as 1 mm/1000. See link below to Newport.
>>>>> 
>>>>> Could the error be related to that you are not reflecting directly off
>>>> the grating surface? The experiment shows sending the beam thru the
>>>> grating? If so, could there be an angle error induced?
>>>>> 
>>>>> Could it be that the grating is facing the wrong way? Thus creating an
>>>> offset due to the medium thickness of the grating material?
>>>>> 
>>>>> Good summary on defraction gratings.
>>>>> https://www.newport.com/t/grating-physics
>>>>> 
>>>>> Jim
>>>>> 
>>>>> 
>>>>> Sent from my iPad
>>>>> ______________________________________________________________
>>>>> Laser mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:Laser at mailman.qth.net
>>>>> 
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> ______________________________________________________________
>>>> Laser mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Laser at mailman.qth.net
>>>> 
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> 
>>> 
>>> 
>>> 
>>> --
>>> 
>>> Chuck Hast  -- KP4DJT --
>>> I can do all things through Christ which strengtheneth me.
>>> Ph 4:13 KJV
>>> Todo lo puedo en Cristo que me fortalece.
>>> Fil 4:13 RVR1960
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>> 
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> 
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>> 
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>> 
> 
> 
> 
> -- 
> 
> Chuck Hast  -- KP4DJT --
> I can do all things through Christ which strengtheneth me.
> Ph 4:13 KJV
> Todo lo puedo en Cristo que me fortalece.
> Fil 4:13 RVR1960
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html


From wchast at gmail.com  Tue May 15 17:20:16 2018
From: wchast at gmail.com (Chuck Hast)
Date: Tue, 15 May 2018 16:20:16 -0500
Subject: [Laser] Chucks question continued
In-Reply-To: <9A4C5DDC-5128-4F32-8074-31FA97066E31@pacbell.net>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
	<CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
	<1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>
	<CADNfBV_vZnPgaO=6EjoN75s_5kxd-BG+-heQO2YhicXmjtV7eg@mail.gmail.com>
	<9A4C5DDC-5128-4F32-8074-31FA97066E31@pacbell.net>
Message-ID: <CADNfBV89qkXEZ6HLJxyEOJLemp3c+ixSt8V4tHsKEtJg+HODNA@mail.gmail.com>

Found it. Interesting.

On Tue, May 15, 2018 at 9:06 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:

> Mike found a spectrometer on eBay.
> New they are about $150, and there is a $70 model as well. From a French
> company Thunder Optics.
> Jim
>
> Sent from my iPhone
>
> > On May 14, 2018, at 9:44 PM, Chuck Hast <wchast at gmail.com> wrote:
> >
> > Jim,
> > Looks like I missed something did not see anything from Mike just saw
> > your response. Is it some sort of spectrograph or spectrometer?
> >
> >
> >> On Mon, May 14, 2018 at 11:32 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >>
> >> Mike,
> >> Looks like that is pretty cheap.
> >> Looks like it is about 3nm resolution, and about 2 month delay to
> shipment.
> >> You have to calibrate it yourself.
> >> Might be interesting.
> >> Let us know how it goes.
> >> Jim
> >>
> >>
> >> Sent from my iPad
> >>
> >>> On May 14, 2018, at 8:08 PM, Chuck Hast <wchast at gmail.com> wrote:
> >>>
> >>> Jim,
> >>> That did it. Now to go through it and get it into a stand alone little
> >>> piece of
> >>> say python code. A good exercise for me...
> >>>
> >>> Then the larger angle was probably what was taking a bite out the
> >> numbers in
> >>> the original calculation using the formula that you indicated was doing
> >> the
> >>> approximation.
> >>>
> >>>
> >>>> On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net>
> wrote:
> >>>>
> >>>> Chuck,
> >>>> It looks like we may have sin and tan issues here
> >>>>
> >>>> Original cited article:
> >>>> http://laserclassroom.com/products/measure-wavelength-laser-light/
> >>>>
> >>>> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
> >>>> That?s diffraction distance (X) / distance to target (L)
> >>>>
> >>>> The grating equation is WL = d sin(32.08771207), d=1000/mm
> >>>> Or 531.2 nM.  That matches your laser source.
> >>>>
> >>>> Note that in your original cited article approximates sin = tan.
> >>>> This is true when the angle is small, but introduces errors at larger
> >>>> angles.
> >>>>
> >>>> Here?s a calculator for the experiment: not using the approximation.
> >>>> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
> >>>>
> >>>> Jim
> >>>>
> >>>> Sent from my iPad
> >>>>
> >>>>> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
> >>>>>
> >>>>> Chuck,
> >>>>>
> >>>>> After rereading, I think my statement on d is not correct. It may be
> as
> >>>> simple as 1 mm/1000. See link below to Newport.
> >>>>>
> >>>>> Could the error be related to that you are not reflecting directly
> off
> >>>> the grating surface? The experiment shows sending the beam thru the
> >>>> grating? If so, could there be an angle error induced?
> >>>>>
> >>>>> Could it be that the grating is facing the wrong way? Thus creating
> an
> >>>> offset due to the medium thickness of the grating material?
> >>>>>
> >>>>> Good summary on defraction gratings.
> >>>>> https://www.newport.com/t/grating-physics
> >>>>>
> >>>>> Jim
> >>>>>
> >>>>>
> >>>>> Sent from my iPad
> >>>>> ______________________________________________________________
> >>>>> Laser mailing list
> >>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>>>> Help: http://mailman.qth.net/mmfaq.htm
> >>>>> Post: mailto:Laser at mailman.qth.net
> >>>>>
> >>>>> This list hosted by: http://www.qsl.net
> >>>>> Please help support this email list: http://www.qsl.net/donate.html
> >>>> ______________________________________________________________
> >>>> Laser mailing list
> >>>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>>> Help: http://mailman.qth.net/mmfaq.htm
> >>>> Post: mailto:Laser at mailman.qth.net
> >>>>
> >>>> This list hosted by: http://www.qsl.net
> >>>> Please help support this email list: http://www.qsl.net/donate.html
> >>>>
> >>>
> >>>
> >>>
> >>> --
> >>>
> >>> Chuck Hast  -- KP4DJT --
> >>> I can do all things through Christ which strengtheneth me.
> >>> Ph 4:13 KJV
> >>> Todo lo puedo en Cristo que me fortalece.
> >>> Fil 4:13 RVR1960
> >>> ______________________________________________________________
> >>> Laser mailing list
> >>> Home: http://mailman.qth.net/mailman/listinfo/laser
> >>> Help: http://mailman.qth.net/mmfaq.htm
> >>> Post: mailto:Laser at mailman.qth.net
> >>>
> >>> This list hosted by: http://www.qsl.net
> >>> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >> ______________________________________________________________
> >> Laser mailing list
> >> Home: http://mailman.qth.net/mailman/listinfo/laser
> >> Help: http://mailman.qth.net/mmfaq.htm
> >> Post: mailto:Laser at mailman.qth.net
> >>
> >> This list hosted by: http://www.qsl.net
> >> Please help support this email list: http://www.qsl.net/donate.html
> >>
> >
> >
> >
> > --
> >
> > Chuck Hast  -- KP4DJT --
> > I can do all things through Christ which strengtheneth me.
> > Ph 4:13 KJV
> > Todo lo puedo en Cristo que me fortalece.
> > Fil 4:13 RVR1960
> > ______________________________________________________________
> > Laser mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/laser
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:Laser at mailman.qth.net
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
>
> ______________________________________________________________
> Laser mailing list
> Home: http://mailman.qth.net/mailman/listinfo/laser
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Laser at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>



-- 

Chuck Hast  -- KP4DJT --
I can do all things through Christ which strengtheneth me.
Ph 4:13 KJV
Todo lo puedo en Cristo que me fortalece.
Fil 4:13 RVR1960

From mike1 at mgte.com  Tue May 15 22:53:34 2018
From: mike1 at mgte.com (Mike Couture)
Date: Tue, 15 May 2018 22:53:34 -0400
Subject: [Laser] Chucks question continued
In-Reply-To: <CADNfBV89qkXEZ6HLJxyEOJLemp3c+ixSt8V4tHsKEtJg+HODNA@mail.gmail.com>
References: <A6918650-CE7E-4B76-BFB1-51B2CE8DA45E@pacbell.net>
	<32E567DB-20D7-403A-8EBB-D106CD230B5E@pacbell.net>
	<CADNfBV-KaD2UV26CoLegYWajccEmPdsdi3HKTbLMxiqVAwNxYQ@mail.gmail.com>
	<1FE46C4A-2DEE-4D74-B810-CCB34F52C4AF@pacbell.net>
	<CADNfBV_vZnPgaO=6EjoN75s_5kxd-BG+-heQO2YhicXmjtV7eg@mail.gmail.com>
	<9A4C5DDC-5128-4F32-8074-31FA97066E31@pacbell.net>
	<CADNfBV89qkXEZ6HLJxyEOJLemp3c+ixSt8V4tHsKEtJg+HODNA@mail.gmail.com>
Message-ID: <aed1b6f9-0701-e6ba-cace-36f76b35f67e@mgte.com>

When I get the spectrometer I will surely let everyone know. Oh, and I 
did order mine direct from the mfr instead of ebay, hopefully get it 
quicker.

Mike C.

On 5/15/2018 5:20 PM, Chuck Hast wrote:
> Found it. Interesting.
>
> On Tue, May 15, 2018 at 9:06 AM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>
>> Mike found a spectrometer on eBay.
>> New they are about $150, and there is a $70 model as well. From a French
>> company Thunder Optics.
>> Jim
>>
>> Sent from my iPhone
>>
>>> On May 14, 2018, at 9:44 PM, Chuck Hast <wchast at gmail.com> wrote:
>>>
>>> Jim,
>>> Looks like I missed something did not see anything from Mike just saw
>>> your response. Is it some sort of spectrograph or spectrometer?
>>>
>>>
>>>> On Mon, May 14, 2018 at 11:32 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>>>>
>>>> Mike,
>>>> Looks like that is pretty cheap.
>>>> Looks like it is about 3nm resolution, and about 2 month delay to
>> shipment.
>>>> You have to calibrate it yourself.
>>>> Might be interesting.
>>>> Let us know how it goes.
>>>> Jim
>>>>
>>>>
>>>> Sent from my iPad
>>>>
>>>>> On May 14, 2018, at 8:08 PM, Chuck Hast <wchast at gmail.com> wrote:
>>>>>
>>>>> Jim,
>>>>> That did it. Now to go through it and get it into a stand alone little
>>>>> piece of
>>>>> say python code. A good exercise for me...
>>>>>
>>>>> Then the larger angle was probably what was taking a bite out the
>>>> numbers in
>>>>> the original calculation using the formula that you indicated was doing
>>>> the
>>>>> approximation.
>>>>>
>>>>>
>>>>>> On Mon, May 14, 2018 at 8:21 PM, Jim Moss <n9jim-6 at pacbell.net>
>> wrote:
>>>>>> Chuck,
>>>>>> It looks like we may have sin and tan issues here
>>>>>>
>>>>>> Original cited article:
>>>>>> http://laserclassroom.com/products/measure-wavelength-laser-light/
>>>>>>
>>>>>> The angle based on your data is arctan(627/1000) = 32.08771207 Degrees
>>>>>> That?s diffraction distance (X) / distance to target (L)
>>>>>>
>>>>>> The grating equation is WL = d sin(32.08771207), d=1000/mm
>>>>>> Or 531.2 nM.  That matches your laser source.
>>>>>>
>>>>>> Note that in your original cited article approximates sin = tan.
>>>>>> This is true when the angle is small, but introduces errors at larger
>>>>>> angles.
>>>>>>
>>>>>> Here?s a calculator for the experiment: not using the approximation.
>>>>>> http://hyperphysics.phy-astr.gsu.edu/hbase/phyopt/gratcal.html
>>>>>>
>>>>>> Jim
>>>>>>
>>>>>> Sent from my iPad
>>>>>>
>>>>>>> On May 14, 2018, at 5:40 PM, Jim Moss <n9jim-6 at pacbell.net> wrote:
>>>>>>>
>>>>>>> Chuck,
>>>>>>>
>>>>>>> After rereading, I think my statement on d is not correct. It may be
>> as
>>>>>> simple as 1 mm/1000. See link below to Newport.
>>>>>>> Could the error be related to that you are not reflecting directly
>> off
>>>>>> the grating surface? The experiment shows sending the beam thru the
>>>>>> grating? If so, could there be an angle error induced?
>>>>>>> Could it be that the grating is facing the wrong way? Thus creating
>> an
>>>>>> offset due to the medium thickness of the grating material?
>>>>>>> Good summary on defraction gratings.
>>>>>>> https://www.newport.com/t/grating-physics
>>>>>>>
>>>>>>> Jim
>>>>>>>
>>>>>>>
>>>>>>> Sent from my iPad
>>>>>>> ______________________________________________________________
>>>>>>> Laser mailing list
>>>>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>>>> Post: mailto:Laser at mailman.qth.net
>>>>>>>
>>>>>>> This list hosted by: http://www.qsl.net
>>>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>> ______________________________________________________________
>>>>>> Laser mailing list
>>>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>>> Post: mailto:Laser at mailman.qth.net
>>>>>>
>>>>>> This list hosted by: http://www.qsl.net
>>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>
>>>>> Chuck Hast  -- KP4DJT --
>>>>> I can do all things through Christ which strengtheneth me.
>>>>> Ph 4:13 KJV
>>>>> Todo lo puedo en Cristo que me fortalece.
>>>>> Fil 4:13 RVR1960
>>>>> ______________________________________________________________
>>>>> Laser mailing list
>>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>>> Post: mailto:Laser at mailman.qth.net
>>>>>
>>>>> This list hosted by: http://www.qsl.net
>>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>> ______________________________________________________________
>>>> Laser mailing list
>>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>>> Help: http://mailman.qth.net/mmfaq.htm
>>>> Post: mailto:Laser at mailman.qth.net
>>>>
>>>> This list hosted by: http://www.qsl.net
>>>> Please help support this email list: http://www.qsl.net/donate.html
>>>>
>>>
>>>
>>> --
>>>
>>> Chuck Hast  -- KP4DJT --
>>> I can do all things through Christ which strengtheneth me.
>>> Ph 4:13 KJV
>>> Todo lo puedo en Cristo que me fortalece.
>>> Fil 4:13 RVR1960
>>> ______________________________________________________________
>>> Laser mailing list
>>> Home: http://mailman.qth.net/mailman/listinfo/laser
>>> Help: http://mailman.qth.net/mmfaq.htm
>>> Post: mailto:Laser at mailman.qth.net
>>>
>>> This list hosted by: http://www.qsl.net
>>> Please help support this email list: http://www.qsl.net/donate.html
>> ______________________________________________________________
>> Laser mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/laser
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:Laser at mailman.qth.net
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>


From mike1 at mgte.com  Wed May 16 13:49:15 2018
From: mike1 at mgte.com (Mike Couture)
Date: Wed, 16 May 2018 13:49:15 -0400
Subject: [Laser] Dayton Hamfest
In-Reply-To: <b9c086db-9f04-ce91-4661-6d9a790f9a5e@mgte.com>
References: <b9c086db-9f04-ce91-4661-6d9a790f9a5e@mgte.com>
Message-ID: <6e634f11-000e-ca22-804e-e63fbfe8fa41@mgte.com>

Whoops!? See below.

Mike

On 5/16/2018 1:37 PM, Mike Couture wrote:
> Wow! Almost forgot, anybody, besides me, going to Dayton this week?
>
> Look for this guy !!!
>
> (pic deleted too big for msg to be sent)
>
> Mike C.