My eyes need your help

solowgregg · Dec 20, 2008

I recently purchased a laser that does not appear to have any IR filter that I can find. The front unscrews to reveal a sort of focusing lens. There is no sort of membrane between the front bezel, lens, and diode. Any suggestions?

Thanks

daguin · Dec 20, 2008

solowgregg said:
I recently purchased a laser that does not appear to have any IR filter that I can find. The front unscrews to reveal a sort of focusing lens. There is no sort of membrane between the front bezel, lens, and diode. Any suggestions?

Thanks

If it is a red or a violet (blu-ray) laser it doesn't need an IR filter. If it is a low powered green (<30mW) it doesn't really need one. The amount of IR "leakage" would be pretty small.

Peace,
dave

solowgregg · Dec 20, 2008

It's a 75mw Green.

daguin · Dec 20, 2008

solowgregg said:
It's a 75mw Green.

Then it sounds like it doesn't have an IR filter. Do you have laser goggles? if so, do they filter IR as well as the green? If not, get some.

Peace,
dave

rog8811 · Dec 20, 2008

Try taking a camera phone photo of what is coming out of the aperture of the laser, it may show up the IR as a grey coloured light. Word of warning though, if the camera does not show the IR you must assume that the laser is emitting it and that the phone just couldn't pick it up.

So 2 possibilities.
1) laser emits IR because you have photgraphs of it = use goggles
2) laser may be emiting IR, but not sure = use goggles

Regards rog8811

solowgregg · Dec 20, 2008

I have goggles on the way but is there no kind of filter that can be placed inside the head of the laser?

daguin · Dec 20, 2008

solowgregg said:
I have goggles on the way but is there no kind of filter that can be placed inside the head of the laser?

Yes. You can buy small IR filters from several sources (eBay, lasers dealers, etc.) You can then "glue" the IR filter under the aperture cap. Do NOT use cyanoacrylate (CA, "super glue"). Use something like a small amount of silicone at the edge.

If it really is 75mW you should have goggles anyway.

Peace,
dave

solowgregg · Dec 20, 2008

Oh yes I will definitely be using goggles, thanks for the info.

iknitsteel · Dec 23, 2008

i have a random question about goggles when should you use them and for what color lasers just in general should i get some for a 300mW red laser?

rocketparrotlet · Dec 23, 2008

iknitsteel said:
i have a random question about goggles when should you use them and for what color lasers just in general should i get some for a 300mW red laser?

You should have goggles for any color of laser above 30mW. You should use them whenever doing anything like burning, popping, mirrorwork, etc. Anything close up or with a potential for specular reflections.

So yes, you should absolutely get a pair for a 300mW red laser. (Make sure to get red-specific goggles. I would recommend these, because I've heard good reviews about them and they're pretty cheap: http://www.dragonlasers.com/catalog/Red-laser-beam-protection-640-750nm--Laser-Eyewear-p-16255.html)

-Mark

bobobob121 · Dec 23, 2008

here is a simple solution to tell; take some old film negatives "around 5" that you don't really care about. Cut them out and layer them. place them in front of the laser when on and take a picture from the front. If there is a small white dot then you have IR leakage. A quick test to see if your camera can pick up IR would be to take a picture of your remote control for your tv when changing channels or volume "the diode looking thing" here is a pic to help you out

Bionic-Badger · Dec 24, 2008

That pic is not helpful at all. It's a blurry, giant 3872 x 2592 image stuck in a scrolling window. Who can even tell what the hell that is? Will you please resize that?

daguin · Dec 25, 2008

Here ya go

bobobob121 · Dec 29, 2008

thanks daguin = D

and the reason for it being large and blury is because my camera is 10.2 mp on RAW mode and i had to put it on a really high iso speed to capture the flashing light

Pavlos93 · Jan 21, 2009

I think goggles are a good solution...but which company sells good goggles guys??

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