[Laser] Depth of modulation for various lamp types

[F1AVYopto at aol.com]

Dans un e-mail daté du 11/09/2006 23:53:15  Paris, Madrid (heure d'été), 
ckpooley at sbcglobal.net a écrit :
This  will not work well.  The bandwidth for incandescent requires rapid 
cooling,  which calls for the highest possible filament temperature.

That is right  but the silicon photodiodes have an abrupt response decay 
after 1100 nm and a  slow response improvement from 400 to 900 nm
I think the increase of  modulated signal on very under-powered lamp with a 
PN or PIN photodiode is due  to the spectrum modulation.
Chris Long noticed this under-powered lamp  property when he used his first 
TX RX light com system with a small lamp as  TX.
However, of course, the best way to radiate a fully modulated  infrared 
signal is the use of big power LED matrixes.
Yves F1AVY