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Old 10-09-2011, 07:29 PM #1
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Default PHR IR/red or 808nm red diode for Night Vision use? I need low power & sharp beam

So I'm still looking to make an IR laser for night vision use. I'll probably just stick it in a cheap airsoft weapon laser host. I think 808nm would be more "invisible" and better sensitivity for the NV... but 780nm is very cheap and common. Other LPF members seem to show that 780nm works good in videos. Even cooler would be if I could use a dual output red/IR diode to switch between visible and invisible.


If the PHR diode doesn't work for my needs, I could use some help with diode sugestions from you guys - any suggestions?
I think I would need less than 50mW from any of the wavelengths to get the job done...
More importantly, I would need <1mrad of divergence. Closer to 0.5mrad if it can be done...
What kind of lens (aspherical, 3 piece, acryllic, coated) do I need to get very low divergence. Or do I need a small beam expander?

Initially I'm thinking of the 5.6mm PHR red/IR diode... it's cheap and could get the job done if it can output up to 50mW.
What is the power output of the IR and 650nm output? What is the input current/voltage? As a weapon sight, the dot placement would have to be precise. Would the Red & IR colors have the same point of aim and diergence, or would there be a shift/change when swtching between the red or IR diode?


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Old 10-10-2011, 03:42 AM #2
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Default Re: PHR IR/red or 808nm red diode for Night Vision use? I need low power & sharp beam

hey from my IR and night vision discoveries, most cheapish NV equipment can see 780 and 808nm light but not 980nm, (my digital NV can see all 980nm tho).

is this what your referring to :
5mW 650+780nm Infrared IR dual wavelength laser diode | eBay


Ive never used that diode but i imagine the red is going to have better divergence than the IR.

IF that isn't powerful enough, i imagine you would have to build a a dual diode build, with a decent powered red and IR diode in the same host.

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