[Laser] 5mw laser transceiver kit

[Mike]

I have a 6" dia IR filter that was used in front of a lantern. Holding it to
the sun you see ABSOLUTELY no light. Holding it between a magnifying glass
and the sun and you WILL get burned. So, yes, it passes NO 'visible' light
but long wave IR.

Mike C.

-----Original Message-----
From: laser-bounces at mailman.qth.net [mailto:laser-bounces at mailman.qth.net]
On Behalf Of Tim Toast
Sent: Thursday, September 30, 2010 12:54 AM
To: laser at mailman.qth.net
Subject: Re: [Laser] 5mw laser transceiver kit

no? .freaky... A watt of 830nm light can't be felt on the skin. I assume
that's spread out to one inch diameter or so. That sort of brings up an
interesting point about sunlight when comparing it with other sources i 
guess. That 1000 watts per square meter, or 0.1 watts per sq cm, that you 
feel on your skin from the sun, is mostly due to light in the longwave
infrared portion of the spectrum. 

> 
> 
> ------------------------------
> 
> Message: 5
> Date: Wed, 29 Sep 2010 19:18:36 -0400
> From: Tom Becker <GTBecker at RighTime.com>
> Subject: Re: [Laser] 5mw laser transceiver kit
> To: Free Space LASER Communications <laser at mailman.qth.net>
> Message-ID: <4CA3C94C.6030403 at RighTime.com>
> Content-Type: text/plain; charset=ISO-8859-1;
> format=flowed
> 
>   > ... Is there a point (right in front of the
> illuminator) where it 
> feels like sunlight on your hand?
> 
> No, but mine's a 63-year-old hand. :)  If you mean a
> sensation of 
> radiated heat, no, not from the barrel illuminator. 
> Thermal IR is a 
> long way from 850nm.
> 



      
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