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Old 03-06-2010, 02:05 PM #17
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Default Re: These laser safety goggles with that laser?

K i understand now. Thanks


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Old 03-06-2010, 02:29 PM #18
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Exclamation Re: These laser safety goggles with that laser?

Sorry, my mistake, i had to post these ones before, for explain better what i mean.

I was referring about these types of goggles, and all the ones that resemble these ones:



These are, sometimes, sold as "laser goggles", but they AREN'T laser safety goggles, just anti-chips for grinders ..... as you can see in this other pic, with AGC turned off, so the camera don't change the light, the beam passing through the lens is approximatively half of the one pointed directly on the mousepad, and this is just a 10mW laser, so i for sure don't call them "safe", for using them as safety goggles



The red ones from focalprice and o-like, instead, are ok ..... don't know personally about the dragonlaser ones, but if they can certify you an optical density of at least 2 (better 3 or more), then i suppose that they are ok .....
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Old 03-06-2010, 09:19 PM #19
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Default Re: These laser safety goggles with that laser?

oh ic thanks. I cant really tell if there OD protected. cause on that link it just shows which OD is which for example

OD>4 @ 190-533nm
OD>3 @ 534-540nm
OD>2 @ 541-548nm


thats what it says on the site. But it doesnt say any thin bout it being OD 2,3,4,5,6 w/e
It also says that its 190-548nm protected.
Does any 1 know if its OD protected?

forgive me if the question sounds noobish above. kind of clueless on goggles

EDIT: im readin the reviews and peeps say that theey protect from green. Not sure if there actually real tho... heard there trusted so i believe :P
ANOTHER EDIT: NVM i found the optical density graph. CONFIRMED that they are OD4

Last edited by shockwave88; 03-06-2010 at 09:24 PM.
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Old 03-06-2010, 09:35 PM #20
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Default Re: These laser safety goggles with that laser?

OD stands for optical density, this is describes the attenuation. The goggles have an OD for a specific wavelength or wavelength range. The OD is defined as the logarithm of the attenuation factor. OD 1 mean 10x attenuation, OD 2 means 100x attenuation, OD 3 means 1000x and so on.

The goggles specification state that the goggles attenuate the 190-533nm wavelength range (from uv to green) with a factor of OD4, that is 10^4=10000x attenuation. This is the meaning of the OD.
A typical high power green laser pointer emits 100mW of 532nm light. The wavelength (the color) falls in the 190-533nm range. Here, the attenuation is OD4. This means if 100mW would be shining straight into the goggles, only one part of 10000 comes through, only 0.01mW is left. This would be low enough not to cause eye damage.

laser safety eyewear protection is not complete with a statement of "OD protected" (whatever that may be) or stating that it protect against 190-548nm. Both the wavelength range and optical density together are needed to determineif they can be used with your laser. The wavelength range must cover the laser's wavelength, the optical density for that range must be high enough depending on the laser power used.

A too low OD passes too much light which is dangerous. A too high OD leaves no dot visible, can be a bit unhandy. The OD is only valid for the specified wavelength or range, outside of that, nothing is guaranteed.
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Old 03-06-2010, 09:38 PM #21
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Default Re: These laser safety goggles with that laser?

Thanks you cleared up alot for me. Yeah they do have a graph that shows its OD4 . But i get it now i will be protected just fine with these glasses. blue

Last edited by shockwave88; 03-07-2010 at 05:09 AM.
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