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Old 08-13-2009, 09:17 AM #1
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Default Safety Google for a 40 watts DPSS 808 nm Laser

does OD rating make any sense for a high power laser like above?


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Old 08-13-2009, 05:22 PM #2
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

afaik 1 OD makes the laser a thousand times weaker, so you need at least OD 10+ to be safe with such high powers
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Old 08-13-2009, 05:59 PM #3
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

DPSS 808nm laser..?
OD1 reduces power by a factor of 10, OD2 reduces by a factor of 100, OD3 reduces by a factor of 1,000, and so on. You want to have at most 5mW going through the goggles, so you want to get at least OD4.
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Old 08-13-2009, 06:29 PM #4
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

I HIGHLY recommend indirect viewing when using very high power diodes. Use a video camera, they work great. Do not look at the laser spot without the camera, expecially if you will be using it to pump crystals. A reflection from an uncoated portion of the crystal or from its surrounding metal mounts will be very dangerous.
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Old 08-13-2009, 06:31 PM #5
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

At LaserGlow's site, their OD5 Glasses have the wavelength and up to 500W. Others say up to 500mW, so I'm not sure if this is a typo, or the different wavelengths have different ratings or something.

Laserglow - Protective Laser Goggles - Fit-over

EDIT: Not to say that even with the glasses, you should look at the beam, that's a no-no.
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Old 08-14-2009, 12:29 AM #6
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

I don't see any typos on the Laserglow goggle page..? For the first pair it says up to 500mW because it is OD2, second pair says over 500mW because it is OD7.
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Old 08-14-2009, 12:36 AM #7
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

Thinking of getting these:

Laser Glasses - Near Infrared (IR) protection 750-850nm :: Laser Safety :: Dragon Lasers



Is it ok for my purpose?
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Old 08-14-2009, 01:26 AM #8
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

Those are only OD3. If that laser somehow gets through the goggles, then the reduced beam will be 40mW. Which can cause damage to the eye, particularily because you can barely see 808nm.
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Old 08-14-2009, 10:50 AM #9
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

As I've mentioned before, the OD rating is pretty irrelevant in this case. Generally an OD rating is used if you want to look at the spot in comfort for focusing. IT DOES NOT TELL YOU HOW MUCH ENERGY THE GLASSES CAN WITHSTAND, so focusing (pun) on OD is a grave error.

What you want here, is PROTECTION from a nearly invisible high-power beam. For that (and with 40W), you'll most likely need glasses that have a reflective coating for the wavelength in question, which are likely to cost a bundle.

So, forget all answers that mention "OD". Check this thread for someone (AndrewGW) who may give you more relevant info.
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Old 08-17-2009, 03:05 AM #10
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Default Re: Safety Google for a 40 watts DPSS 808 nm Laser

Thanks guys, for the insights..
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