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532nm Laser attenuation

Zeebit

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Hey guys,

I don't know if this has been observed before or maybe a thread has already been made regarding this.

I was watching some stereoscopic 3D videos this evening when I tried to put my greenie in front of the glasses. The cyan lens did not do anything to the laser but the red lens attenuated almost all of the green light. I don't know what is really happening since this is just are just a pair of 3D glasses and not laser glasses.

Maybe it has something to do with the red color of the lens? I've also noted that safety glasses for green lasers have red colored lenses.

Sorry for the the pics. Me and my camera totally suck at taking pictures :(

Control shot


With 3D glasses in front. Leaking IR is visible through the camera. I could still see a very faint green dot but I think its is way less thank 1mW
 
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grainde

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Yes basically. It depends on the dye used in the plastic lens and its absorbance spectrum. As a general guide a coloured lens will reduce ie absorb the light from its complementary colour. This is NOT a rule however!! As it depends on the exact absorption peaks characteristic of the particular dye molecule(s) and in the case of lasers whether the wavelength specific to the laser is absorbed. The the amount of light transmitted will depend on the OD of the lens, which is again dependent on the absorption co-efficient of the dye, the amount of dye present and path length ie thickness of dye layer.

There are several threads covering this topic here's one:
http://laserpointerforums.com/f53/blublockers-vs-red-safety-glasses-pics-included-75703.html

The red/purple as you correctly stated, is the IR leakage picked up by the camera.

Although these glasses do appear to protect somewhat against a low power green, they cannot be considered safe for use with lasers especially of higher power. So please dont even consider it! :beer:

Edit: Just in case your asking why...one blast from a high power 445 or 532 will more than likely punch a hole straight through the thin and flimsy film...
 
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Zeebit

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Thanks for explaining stuff. I do not plan to use it to protect my eyes because I know that this is not designed to do so. It did melt under my green laser.
 

DrSid

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Most common materials do not filter specific wavelengths well enough. But here and then you can find some which do.
Still dedicated protection goggles are the best. Not only they filter well, they are also tested to stand the power for some time, and even the fact that they hold well on your nose and cover eyes completely from all sides is important for protection.
 




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