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Old 06-11-2009, 10:47 PM #1
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Default Safety glasses showing red dot thru lens

I just got some laser safety glasses with Protection from 190nm to 540nm and when I put these on I can see a small red dot from my 50mw greeny and 130mw blu-ray but when I take the goggles off and shine the laser through them onto a background I cannot see the dot. What gives

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Old 06-12-2009, 12:05 PM #2
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I would think that the red dot you see through your goggles with the 532nm greenie is the bit of IR leakage. I'm sure it is.
I cannot explain why you see a red dot through goggles with your BluRay though.
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Old 06-12-2009, 12:45 PM #3
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Are you colourblind? I am red/green colourblind and sometimes think green dots from really weak greenies look red (a really weak one corresponding to yours after passing through goggles.)
Like sportcoupe however I have no idea about how a BR could appear red :S
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Don't be an idiot - protect yourself with proper goggles and never point a laser at living things or vehicles, especially aircraft.
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Old 07-05-2009, 08:54 PM #4
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Default Re: Safety glasses showing red dot thru lens

I'm not sure whether any of the 808nm "IR" (which is very faintly visible as laser radiation) makes it out of a green laser as it's not emitted along the axis afaik, or whether only the 1064nm component (which is definitely invisible) does...

For the BR, the solution might be that the near-UV causes many substances to fluoresce. In my experience, the most common resultant colors are green and a pink/red. Quite possibly the dyes fluoresce a bit as well. This might also be the explanation why you see red with a green laser.

This would also explain why you can see the red only by looking through your goggles: then the light is focused by your eyes. Since it's not laser radiation, it gets emitted in all directions and can't project a dot.
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Old 07-10-2009, 03:04 AM #5
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Default Re: Safety glasses showing red dot thru lens

This has NOTHING do do with IR, it always happens. I think it's mostly because the lens absorbs the laser light, and looking through them just dulls your vision of that wavelength. It's a good thing; just think of them as "one-way goggles".
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