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|03-08-2016, 02:27 PM||#1|
Join Date: Mar 2016
Posts: 1Rep Power: 0
I see dead "waves" :)
i'm trying to make another illuminator , i have a lab 808nm IR laser ( 150mw) , i can see the beam with my night vision camera , but i have a problem :
i send the laser to a white paper on the wall , film the wall .
I can see a really bright spot in the center , and lot of circlex around this spot , and some kind of waves all around the same spot .
It's clearly unuseable for IR illumination , impossible for me to understand what i'm illuminating .
So my question : what kind of optics do they use to flatten the spot ??
|03-08-2016, 08:13 PM||#2|
Class 2 Laser
Join Date: May 2011
Posts: 377Rep Power: 1651
Re: I see dead "waves" :)
I think what you're seeing are diffraction artifacts that most laser diodes will produce. Rather than trying to clean up the laser I'd suggest you use a high power IR LED instead. They're available with several watts of optical output in many wavelengths.
1.157 watt 447
2 meter long hene @ 57mW
Assorted greenies, best @ 244mW of 520