[Laser] Re : Strange effect

[Garnier Yves]

Hi Tim
After a long duration Internet scan, I finish to find some data about the output wavelenght for a photodiode used as a LED.
For the silicon diode, the peak power is near 1.1 micron wavelenght.
The yield is very low so a good use could be to realise a very low level beacon
73
Yves

 
Yves F1AVY
http://f1avyopto.wifeo.com


________________________________
 De : Tim Toast <toasty256 at yahoo.com>
À : laser at mailman.qth.net 
Envoyéle : Mardi 13 mars 2012 20h48
Objet : Re: [Laser] Strange effect
 
Hi Yves
I would have to agree with the other responces you got and say the photodiode is emitting 1 or 2 microns and the pyrodetector is either seeing the 2 micron weakly (at the upper edge of its bandwidth) or is just responding to the heat generated near 10 microns. The germanium detector is seeing the radiation directly and so has the best responce. Makes sense :-) ...it is still strange to see a detector emit light at such a far removed wavelength, when LED's detect at almost the same wavelength - differences in construction i imagine.

-toast


Message: 1
Date: Mon, 12 Mar 2012 15:02:27 -0400 (EDT)
From: f1avyopto at aol.com
Subject: [Laser] Strange effect
To: laser at mailman.qth.net
Message-ID: <8CECE99CD6BB8D3-1FD0-F47D at webmail-d064.sysops.aol.com>
Content-Type: text/plain; charset="utf-8"

Hi all
I need some help to evaluate a strange effect
I try today to bias direct way some PIN silicon phodiodes with a rather high current.
Some large area epoxy case photodiodes (1 cm?) was biased to 20 mA without apparent damage.
In dark condition I cannot see any light but a K3PGP RX with a silicon photodiode receives a signal to 20 cm...
A germanium phototransistor gives a strongest response...
I got also a solid signal with a pyroelectric detector from a motion detector.
What could be the bandwidth and the spectrum of this produced light ?
Thank you for the help.
73
Yves F1AVY
http://f1avyopto.wifeo.com/    

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