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Old 05-18-2011, 10:05 AM #1
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Default infrared

Hey guys I have a this laser here
http://www.focalprice.com/detail_LP237B.html
should I worry about the infrared? I did the laser>cd>paper test and I got two green reflactions. The camera I used sees IR (from TV remote) as blue.
here is a video
YouTube - IR or no worres?
From what I can see there isn't any IR at all however, I'm not so sure I did it right


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Old 05-18-2011, 12:41 PM #2
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Default Re: infrared

Those lasers always have some IR leakage, but for see it, you need to filter away the green part, otherwise it overlay the IR part and you cannot see it.

The easiest way for do this, is to pass the beam through a lens of laser safety goggles (also cheap FP ones are ok), and take the image with the camera on a white paper ..... in this way, all the light that you can see through the camera must be the IR part only ..... if you see it focused, then it can be dangerous, if instead you can see it as a "diffused halo" at short distance, it's not focused, it can be dangerous at short distance, but probably not from long distance and random reflections.

Anyway, remember: safety first (also known as "better safe than sorry" principle )
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Old 05-18-2011, 12:55 PM #3
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Default Re: infrared

^^^^ I understood you the first time...
You don't need to say it twice......

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Old 05-18-2011, 12:58 PM #4
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Default Re: infrared

quick reply

heres a video I made pointing through safety goggles on my wall
YouTube - green laser through safety goggle
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Old 05-18-2011, 01:03 PM #5
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Default Re: infrared

and this one
YouTube - comparing with through safety goggle and with out

Last edited by goatman; 05-18-2011 at 01:06 PM.
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Old 05-18-2011, 01:13 PM #6
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Default Re: infrared

Quote:
Originally Posted by lasersbee View Post
^^^^ I understood you the first time...
You don't need to say it twice......

Jerry
LOL, sorry ..... line glitch


EDIT: @goatman: perhaps only partially collimated ..... still a problem if the distance is short (red goggles don't filter IR), but can be not too much dangerous for long distances ..... if you can meter it is better, anyway try to avoid unwanted reflections, and never point it in the eyes of anyone.
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Old 05-18-2011, 06:48 PM #7
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Default Re: infrared

c'mon guys do i have a safety problem or not?
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Old 05-18-2011, 08:21 PM #8
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Default Re: infrared

I had a similar "200mw" laser, 80mw of green, 20mw of IR. I'd say you have a safety problem, even more because you have no idea of the output of the laser. Get an IR filter or IR blocking safety goggles. IR filters can be found pretty cheap btw.
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