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Old 04-12-2009, 05:40 PM #1
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Default Are these Safe to use?

I have a pair of UVEX safety goggles that state the following on the lens:

"For viewing of diffuse laser light only. O.D. 7 @ 190-532nm, 3+ @ 800-839nm, 4+ @ 840-864nm, 5+ @ 865-1063nm, 7+ @ 1064nm"

Although the OD rating seems to be ok from what I have read, its the initial part of the statement above regarding 'diffuse laser light' that has me concerned. Are these safe to use with green lasers < 300mW?


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Old 04-12-2009, 05:47 PM #2
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Default Re: Are these Safe to use?

They should be.
About the diffuse laser light thing, it means that the goggles are not made to withstand a direct hit. So don't be foolish and shine the laser in your eyes while wearing the goggles
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Old 04-13-2009, 08:34 PM #3
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Default Re: Are these Safe to use?

I am a bit concerned about the fact that they state 190-532nm.. Does that mean they will not block as well it if the nm is slightly higher than 532nm? nm can vary with up to 10nm so if I were you I would try to pop a balloon through the glasses with the laser. If it cannot pop a balloon even after several seconds I would say it's safe
Rating on safety equipment always confuses me, and you never want to risk something happening because you asumed the wrong thing.
Good luck
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Old 04-21-2009, 12:37 AM #4
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Default Re: Are these Safe to use?

Quote:
Originally Posted by Jaseth
I am a bit concerned about the fact that they state 190-532nm.. Does that mean they will not block as well it if the nm is slightly higher than 532nm? nm can vary with up to 10nm so if I were you I would try to pop a balloon through the glasses with the laser. If it cannot pop a balloon even after several seconds I would say it's safe
Rating on safety equipment always confuses me, and you never want to risk something happening because you asumed the wrong thing.
Good luck
DPSS green lasers are ALWAYS 532nm. The first crystal changes the light to 1064nm, and the ktp divides that in half. You can be sure that all light coming through the first crystal is 1064nm (Although if there's an allignment problem or the lasers is lacking an IR filter, you'll get some IR in there, but the green is always the same.).
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Old 04-21-2009, 02:19 AM #5
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Default Re: Are these Safe to use?

Quote:
Originally Posted by Jaseth
I am a bit concerned about the fact that they state 190-532nm.. Does that mean they will not block as well it if the nm is slightly higher than 532nm? nm can vary with up to 10nm so if I were you I would try to pop a balloon through the glasses with the laser. If it cannot pop a balloon even after several seconds I would say it's safe
Rating on safety equipment always confuses me, and you never want to risk something happening because you asumed the wrong thing.
Good luck
Even if it did drift a few nm (which is for the most part impossible with conventional 532nm dpss) it's not like the OD goes to nothing and all the sudden 533nm light comes blazing through Those seem like some good goggles, especially since they cover such a wide range!! Basically everything dangerous except the red wavelengths
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Old 04-22-2009, 07:15 AM #6
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Default Re: Are these Safe to use?

I don't think so if they are safe. But.... they should be :-/
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Old 05-08-2009, 10:24 PM #7
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Default

Hi

Uvex/laservision products tend to be good quality, and they are generally well on top of laser safety legislation.

Regarding the 190-532nm rating, it means the filter has been tested with a laser centred at 532, so a 532nm DPSS should be fully covered despite its linewidth extends a fraction of a nanometer further than 532


Quote:
Originally Posted by Jimmymcjimthejim View Post
About the diffuse laser light thing, it means that the goggles are not made to withstand a direct hit. So don't be foolish and shine the laser in your eyes while wearing the goggles
I am not sure for the US standards, but here in Europe all laser safety eyewear are made to withstand accidental direct hits. The "For viewing of diffuse laser light only" is there because laser safety policies should allow direct viewing of the laser under very strict conditions only. (I think it is safe to look indefinitely a laser of less than 50 microwatt)

The laser safety standard in force in Europe (EN 207) specify that laser safety goggles should be able to withstand a direct hit from the laser for which they have been selected for at least 10 seconds (cw) or 100 pulses (pulsed mode).
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Old 05-09-2009, 03:35 AM #8
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I never understood why people want to cut corners on this...

FFS people, buy certified goggles. $50 is a very, very, very small price to pay for the use of your eyes. My life insurance company values the use of my eyes at $1,000,000... If you can't afford $50 for goggles you shouldn't be in this hobby to begin with.

EDIT: I think I replied to the wrong post... I thought I was replying to the "homemade safety goggles" thread... Hmm. That's odd. Anyways, disregard my post.
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Old 05-11-2009, 11:52 AM #9
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I'd buy those off you in heart beat if that's the OD you have for them. I looked at the company and it looks good too. How much did you pay for them? If you are ever selling them I'd want em.

I think diffuse means simply that the goggles are not meant for the beam to point at the lens for a long period of time. I bet they were made for watt output lasers not mW output lasers.

This will help, from the old forum format sticky. Credit to Raknork


Quote:
Snipped from

https://www.omegafilters.com/index.p...ech_fildes_top

"Transmission can be expressed either as a percentage (e.g., 90%) or decimally (e.g., .90). Optical density is always expressed as the negative logarithm of transmission. Unit conversions are:

OD = -log10 T or T = 10-OD "


What this tells me is that a 532nm filter of OD 10 would transmit 1/1010 - 0.00000001% of the light at that wavelength. That's not much! Those OD10 goggles are probably meant for high power (multi-kilowatt) green pulsed lasers.

There is a handy OD conversion chart linked at the above page which shows the transmittance for fractional OD values up to OD4. Multiplying the transmittance value by your laser power will tell you how many mW (or fractions thereof) will pass through.

https://www.omegafilters.com/index.p...tech_con_chart

Example: OD 3 transmits 0.1%, so a filter that is OD3 at 532 will let through 0.1mW from a 100mW laser operating at that wavelength.

So what we have in essence is this progression:

OD1 transmits 10%
OD2 transmits 1%
OD3 transmits 0.1%
OD4 transmits 0.01%
OD5 transmits 0.001%
OD6 transmits 0.0001%

Now you can see why people are complaining that they can't see their lasers through certain goggles!
My goggles are OD 5 for 180-395nm and OD 3 for 395-540nm (green) covers IR too. So a 300 mW direct hit from an nm 532 laser would equal 0.3 mW wearing my goggles. Yours would equal 0.0003 mW! I think they might even be TOO much, can you see any dots of from a green laser?
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Last edited by laser83; 05-11-2009 at 11:57 AM.
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