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Old 12-29-2009, 01:22 AM #1
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Default Goggles for 2W greenie

What are your thoughts on these glasses? :

LSI 100-30-130 Laser Safety Eyewear

I bought them but they are backordered so I have an option to get something else at this point. This are OD7 so they should be adequate, but they are a little pricey. Any suggestions would be appreciated.

Thanks,
MR


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Old 12-29-2009, 04:44 AM #2
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Default Re: Goggles for 2W greenie

I really don't think you need that high of an OD rating. After all, OD 2 would reduce your 2W laser to only 20mW, which is very safe if you use safe handling procedures anyway.

400-532nm Hobby and Education Protective Eyewear [NOR-AL2-00000H-700] - $47.93

or

ML7 - KTP, YAG, Red/IR Diode Protection ML7 Laser Protective Eyewear [NOR-ML7-00000] - $156.60
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Old 12-29-2009, 01:23 PM #3
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Default Re: Goggles for 2W greenie

Thanks for the reply. I think I went a little overboard on the OD rating as well. I think that was fueled by the eye-burning stories I read on this site Anyway, I'm going to try to cancel this order and get something with an OD3-4.

Thanks for your help.
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Old 12-31-2009, 12:39 AM #4
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Default Re: Goggles for 2W greenie

Well I ended up keeping the OD7 glasses and I think I'm glad I did. This thing is super bright. If I get another pair, I'll probably go down to OD4-5 thought.
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Old 12-31-2009, 02:24 PM #5
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Default Re: Goggles for 2W greenie

@bryce007: OD2 is too low! 20mW is dangerous, safe handling is just an excuse and can cost you your eyes! And the ML7 have a too low VLT, red blocking isn't needed here, and the OD is also too low. And the "hobby and education" goggles probably melt way too fast, they aren't designed for these high powers. Every pro always uses proper goggles

@moonraker: The glasses you bought also block IR, it shouldn't be needed with a quality green laser, but the glasses now also can be used with 1064nm yag lasers, and longer wavelenth diodes >=850nm (no 808nm rating though). The glasses are ANSI certified. I always prefer EN207, but I think you bought very nice goggles! If you decide to buy lower OD glasses, don't go beneath OD 3.3. Also mind that the glasses need to be able to withstand a direct hit without melting down too soon.
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Old 12-31-2009, 03:43 PM #6
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Default Re: Goggles for 2W greenie

Laser Glasses - UV to Green Lasers Protection 190-548nm :: Laser Safety :: Dragon Lasers

I own those, and they have an OD rating of 4 for 532nm, and block UV upto the higher end of the green spectrum.

This means they only permit 0.01% of the laser, so as Bryce said it would allow 20mW to get through, while this is still above the safe limit of 5mW, it's not a pointer you own but a heavy lab laser that is unlikely to slip or fall and hit you in the eye... The main thing you have to worry about is reflections and the scatter.

Those goggles you bought did seem ridiculously expensive but I guess if you can afford it, why not.
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Old 12-31-2009, 06:17 PM #7
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Default Re: Goggles for 2W greenie

OD4 indeed only passes 0.01%, which is 0.2mW for 2W input.
OD2 passes 1%, which would be 20mW, too much.

Even with lab lasers, follow the regulations, because unless you just have a laser to admire the dot, you'll be working with optics that have reflections. Accident have happened because an optic piece didn't have the AR coating requested. Reflections too can hit you in the eye, and a mirror reflects enough to count the reflections as a direct hit.

These glasses aren't even that expensive for polycarbonate based laser eyewear, I guess this is even a good price.
Laservision sells nice glass filter based goggles, I have something like these laying around in the university lab. Quality costs something, you don't take risks with high power lasers. So I think Moonraker was doing the right thing buying proper glasses. If you ever want lower OD glasses, consider these (no IR blocking tough, these do).
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Old 01-01-2010, 06:14 PM #8
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Default Re: Goggles for 2W greenie

Thanks everyone for the replies. Very helpful information here.
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