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Old 01-22-2010, 01:01 AM #1
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Exclamation Can goggles block green and IR?

It's for a 50 mW green laser I recently bought from o-like so I'm not sure if it has an IR filter. Will the IR coming from it be dangerous or can I buy a regular pair of green - only safety glasses?
If so then...
Are there any cheap (<30$) safety glasses that can block both 532 nm and IR?
If so then...
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Old 01-22-2010, 04:50 AM #2
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Arrow Re: Can goggles block green and IR?

Only green & IR goggles I can think of in that price range is ZoneStealth multi wavelength goggles they claim to work for 200-540 & 800-2000nm US$39.00 Free Shipping. But they are NOT certified Laser safety goggles. And they may be crap, see this thread. Also a review of them is here. Not tested with a LPM tho so it doesn't tell us much really. (note the sticker on the green blocking goggles shows them as 200-540nm 800-2000nm)

An unfiltered green would produce IR at 808nm & 1,064nm. You can check for IR with a camera as many can see IR (some have an IR filter but enough IR may still get though). In order to get your green to only generate IR without the green (if it doesn't normally do so when cool) you could try placing your green in the fridge for a bit.

It might be better to buy an IR filter for your green. $1 25mm square IR blocking filter Absorbs ~85% IR. But they are out of stock at the moment. BG-38 is a better filter if you can find some. (Anyone got a link to buy BG-38?)

Quote:
Originally Posted by ElektroFreak View Post
The optotronics filters are KG-2 or equivalent. Here is the transmission datasheet: Schott KG2 Glass Transmission Filter Data | Optical-Filters.com
You can see that the cutoff curve is not as steep as for BG-38 (the preferred IR filter material) as you can see here: Schott BG 38 transmission data sheet | BG38 Optical-Filters.com
If you compare the two graphs, you'll see that the KG-2 allows a bit more light through at 808 and 1064nm than the BG-38. The steeper curve means better filtration.
Quote is from this thread
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Old 01-22-2010, 05:04 AM #3
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Default Re: Can goggles block green and IR?

Oh yea, as to whether the IR is dangerous from a 50 mW green... Well people seem to have different opinions on that, some claim that since the IR is less focused then the green beam its less of a risk. But you can't see any of the IR that might be hitting a reflective objects & bouncing into your eye. And the wider IR spread would hit things your green dot isn't. Better safe then sorry no?
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Old 01-22-2010, 02:24 PM #4
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Default Re: Can goggles block green and IR?

My opinion: unless you have goggles for it, the IR is dangerous. Spread or not, even when you get a direct hit of the green, you're only protected for the green and the IR passses completely. So not really safe at all.
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Old 01-22-2010, 03:18 PM #5
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Default Re: Can goggles block green and IR?

What make IR most dangerous is that you cant see it. It could be hitting your eye and you wont even know it.
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Old 01-22-2010, 04:35 PM #6
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Default Re: Can goggles block green and IR?

If you find out that your laser is indeed spewing IR, PM me your address, & I'll send you an IR filter that can be silicone glued (carefully) to the inside of the aperture cap. rob
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