My eyes need your help

[solowgregg]

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]

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]

It's a 75mw Green.

 

[daguin]

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]

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]

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

 

[daguin]

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]

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

 

[iknitsteel]

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]

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]

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]

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]

Here ya go

 

[bobobob121]

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]

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