[Laser] 5 mW lasers & LEDs - Detectors

[Kerry Banke]

Here is the 1 mm area photodiode I have been using  with very  good success .
OSRAM SFH203P T1 5MM PIN PHOTODIODE FLAT TOP
Ebay # 161023134451
It's available for I think $13 for 25 detectors.
I can send you a couple if that's all you need.
 - Kerry N6IZW



________________________________
 From: Zack Widup <w9sz.zack at gmail.com>
To: Free Space LASER Communications <laser at mailman.qth.net> 
Sent: Tuesday, November 5, 2013 9:16 AM
Subject: Re: [Laser] 5 mW lasers & LEDs - Detectors
 

I'm more interested in "setups for balls-out record setting distances."
:-)

I wish I could remember the part number of the diode that someone
recommended as one of the best. I do remember it wasn't easily available in
the USA. Also, is there something fairly new that would do well?

I have a few of the Golden Dragon 1-watt red LED's. They are extremely
bright. I recall seeing a mod that can be done by cutting through the case
and cutting one lead internally to make them useful as detectors. I haven't
tried this yet.

73, Zack W9SZ


On Tue, Nov 5, 2013 at 10:50 AM, Steve J. Noll <sjnoll at ix.netcom.com> wrote:

> On 11/1/2013 10:39 AM, Zack Widup wrote:
>
>> Once upon a time, probably several years ago, there was some discussion
>> about what detector diode device was best for laser reception. I remember
>> there was one device in particular that was recommended and that it was
>> somewhat difficult to come by.
>>
>> Things may have changed since then with advancing technology. Are there
>> any
>> suggestions?
>>
>> 73, Zack W9SZ
>>
>
>
> I'd like to see that discussion too!
>
> I believe one may want to look at it two ways - setups "capable of
> communications at a range of at least 1 km." or setups for balls-out record
> setting distances.
>
> For the latter, really can't beat a photomultiplier tube. Next would be an
> avalanche photodiode.
> I just retired from being
 senior test engineer at Advanced Photonix where
> we made large area Silicon APDs, 5mm to 16mm dia, the biggest in the
> industry.
> Unfortunately, they're really expensive, even as surplus, as they're not
> easy to make. Also require ~1800V. As the operating point is temperature
> sensitive they're usually TE cooled.
> These were supposed to be a PMT-killer, they haven't been.  They're the
> sensors in the Optos scanners at your better-equipped eye doctor.
>
> Then there's small area APDs. We made those for long-range barcode
> scanners. 100V to 200V.
> I see on eBay right now First Sensor (formerly Pacific Silicon Sensor)
> AD500 small area APDs for $16 from China. How someone can sell these for $16
> when they're $135 from Mouser is a mystery, one hopes they're not rejects.
> Their spectral response curve is not great. About 155V bias requirement
> which is
 also temperature dependent.
> The biggest disadvantage is the tiny active area (500 um.) Can you get
> most of your receive signal on that 20 mil spot?
> If not then I'd go with a regular silicon photodiode which you can get
> with much larger active areas. And they're cheap.
>
> 73,
> *Steve J. Noll, WA6EJO
> http://www.qrz.com/db/WA6EJO
> http://www.linkedin.com/in/stevejnoll
> *
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