What should you know when buying goggles (glasses)

[fricek12]

Hi, how to choose good goggles?

Many sellers tell you only wavelength and price. But is it everything you need to know?

if I buy glasses with correct wavelength (eg. I m gona use green lasers 532 nm, need to buy glasses for lasers 370-560 nm), does the power of my laser matter too?

Does the 532nm filter in every goggles reduce 532nm light beam to 0 mW ? or it does in percents (eg. 532nm goggles A reduces 90%, so if I use 100mW 532nm laser it will be the same while using 10mW laser without goggles)

If it is in percent, where can I get this informations when buying? is it OD value?

o-like.com shows additional informations like:
Permeate of visible light :>55%
Indensity >5 .0(OD +5,OD +6 )
Attenuation10- 6<N %>10-4 )

what does it mean? I cannot find what the OD value is.

Which values are important?

Thank You

 

[Drew]

optical density link. od3 is reduction of 1000x, so 1W down to 1mW. od2-100x. od1-10x etc

 

[InfinitusEquitas]

optical density link. od3 is reduction of 1000x, so 1W down to 1mW. od2-100x. od1-10x etc

Also don't forget that chinese, and other companies have a tendency to fudge the numbers...

There are links to reputable and certified sources in my signature.

 

[fricek12]

optical density link. od3 is reduction of 1000x, so 1W down to 1mW. od2-100x. od1-10x etc

Thanks, now understand OD. Seems that optical density is the most important value and can be shown as #OD or as Transmittance (before log function).


But... Is the OD the same for any wavelength from the wavelengths interval on goggles? (eg. top and bottom Values has lower OD - goggles for 300 to 600 nm has OD=3, means that 450nm light is reduced 1000x, 400nm/500nm light is reduced eg. 100x and 300nm/600nm light is reduced only 1x (is not reduced))

So is it better to buy "goggles only for 532nm" than "goggles for 370 - 600 nm"?

 

[InfinitusEquitas]

ARG - Blu Ray, Argon, Blue, KTP [NR-ARG-EN207] - $80.50

 

[fricek12]

ARG - Blu Ray, Argon, Blue, KTP [NR-ARG-EN207] - $80.50


......

woow , that is interesting, so that means OD 7+

Thanks

 

[Bluefan]

Thanks, now understand OD. Seems that optical density is the most important value and can be shown as #OD or as Transmittance (before log function).


But... Is the OD the same for any wavelength from the wavelengths interval on goggles? (eg. top and bottom Values has lower OD - goggles for 300 to 600 nm has OD=3, means that 450nm light is reduced 1000x, 400nm/500nm light is reduced eg. 100x and 300nm/600nm light is reduced only 1x (is not reduced))

So is it better to buy "goggles only for 532nm" than "goggles for 370 - 600 nm"?

First: The chinese don't get what OD means:

Indensity >5 .0(OD +5,OD +6 )

What is it, OD 5+ or OD 6+?

Attenuation: (10- 6<N %>10-4 )

Calculating back this says the OD is between 4 and 6.

The worst of all: nothing is actually guaranteed, it's just sold as laser safety goggles and that's it. Most will work, some won't and leave you as good as unprotected.