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Glasses Question

doobler

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Hello!
I've been looking around on the net as well as the forums for which glasses to use to protect from the IR wavelength as well as green 532nm.

I am very weary of mainly the IR as opposed to the green wavelength.

I found a few multiple wavelength laser-shields:
NoIR LaserShields: Laser safety goggles for 1064nm and 532 nm lasers and applications. Nd:YAG and harmonics laser glasses.
NoIR LaserShields: Laser safety goggles for all 980nm, 1064nm, 2780nm, 2940nm dental lasers and applications.
NoIR LaserShields: Laser safety goggles for Nd:YAG, diode and green lasers and applications.
EDIT: Just found this site too: http://www.safetyglassesusa.com/ir-shade5.html
Just IR glasses on that one...but cheap!
Those however, are extremely expensive. (oh the price you pay for vision)
I have also considered the ones on sites such as wicked lasers or focalprice.

What would you guys suggest?
Cheapest(focal price), cheaper (wicked lasers), or a car payment(lasershield multi wavelength)?
 
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jedirock

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Well, I was going to suggest LaserGlow's goggles for KTP crystal alignment, until I saw that they were $289 USD... Even more than any of the NoIR ones directly.

Not sure why you're worried about the IR wavelength though. Unless you have a green laser that doesn't have an IR filter in it (not sure why you wouldn't want one personally), then the IR is already taken care of, and you can go for 532 protection alone. I picked up 2 pairs of goggles rated for OD7+ from 190-532nm from LaserGlow for $90 USD each.

If you're still needing IR protection, you can check out what OEM Laser Systems has. They have a representative here (FrothyChimp) and their glasses are regarded as some of the best in the business. I haven't dealt with them before, but he might be able to get a better price than listed. I would stay away from the cheap goggles myself as I don't know how they perform, but some might do well.

Stay as far away from Wicked goggles as you can though. With the Arctic fiasco recently, it seems WL has been sending out goggles that don't protect nearly enough from the power output of the Arctic. While rated for OD6+ IIRC, they're more around OD3 or OD4.
 

doobler

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I appreciate your input jedirock!
When you said
Not sure why you're worried about the IR wavelength though. Unless you have a green laser that doesn't have an IR filter in it (not sure why you wouldn't want one personally)
I realized i should have specified my question a little better:
I am worried about IR because i assume most lasers do NOT have them(especially the ones from china) unless from a reputable site such as wicked, dragon, sky..or whatever. Assuming i buy from FocalPrice, i just don't know if they actually DO have an IR filter. From my light researching and perusing around the forums, no one has mentioned to my knowledge that they do/don't have one...at least the lasers most commonly purchased on that site. I unfortunately do not have 200$ to burn on rayfoss.com :p

i suppose i can always buy one and then crack the bad boy open to check and see if it has an IR filter or not!

I unfortunately don't have any way to test the power or anything or i could just shine it through normal 532nm green goggles.

Any other input is welcome!
 

Ash

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Safety glasses for 532nm and 808-1064nm (IR) protection:
$42
 

snypr

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This might have been mentioned and I dont mean to thread jack, but why the high price difference in glasses?
 

Ash

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This might have been mentioned and I dont mean to thread jack, but why the high price difference in glasses?
The OEM ones (and some other +$100 safety glasses) actually come with a certification sheet listing the actual OD+ for different wavelengths.
So, the more expensive ones are "certified", and many of the older members will tell you: without certification, you really can't be sure you are protected as completely with the lower-cost glasses as certified ones.
 

Asa

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I appreciate your input jedirock!
When you said

I realized i should have specified my question a little better:
I am worried about IR because i assume most lasers do NOT have them(especially the ones from china) unless from a reputable site such as wicked, dragon, sky..or whatever. Assuming i buy from FocalPrice, i just don't know if they actually DO have an IR filter. From my light researching and perusing around the forums, no one has mentioned to my knowledge that they do/don't have one...at least the lasers most commonly purchased on that site. I unfortunately do not have 200$ to burn on rayfoss.com :p

i suppose i can always buy one and then crack the bad boy open to check and see if it has an IR filter or not!

I unfortunately don't have any way to test the power or anything or i could just shine it through normal 532nm green goggles.

Any other input is welcome!

You should still be more worried about the 532nm wavelength. It's generally much stronger than the infrared output in DPSS lasers (unless your laser is really jacked up, but you'd know it if it were) and much more collimated. And if you're not spending more than $200 on a laser without an infrared filter, it'll probably be a lower power laser without much infrared coming out anyway. But, you can never be too safe, just make sure you know the green is usually the more dangerous part!

Here are some CNI quality <$200 lasers with great infrared filters (they're having a clearance sale). NOVAlasers Home
If you decide to make a purchase there, please refer asafswan@gmail.com in the comments section while you're buying your laser (awards me "lightyear" points)!
 
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ppctx

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You should still be more worried about the 532nm wavelength. It's generally much stronger than the infrared output in DPSS lasers (unless your laser is really jacked up, but you'd know it if it were) and much more collimated. But, you can never be too safe, just make sure you know the green is usually the more dangerous part!

Are you sure this true? To our eyes, green is a more detectible wavelength, but my understanding is that it is the output power that is damaging, irregardless of wavelength (ignoring the fact that wavelengths our eyes can not detect, IR/UV, are scary because you may not know your lazing yourself).

Or are you just assuming that IR is too small a percentage out of any green laser to be concerned with?
 
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Trevor

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Are you sure this true? To our eyes, green is a more detectible wavelength, but my understanding is that it is the output power that is damaging, irregardless of wavelength (ignoring the fact that wavelengths our eyes can not detect, IR/UV, are scary because you may not know your lazing yourself).

Or are you just assuming that IR is too small a percentage out of any green laser to be concerned with?

He just means that in a green laser (unless it's super crappy), you're going to be getting much more green (>90%), and the IR is highly divergent. However, that is not to say that you shouldn't test and add an IR filter if necessary.

-Trevor
 

Ash

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I still think we need some definitive tests on exactly the % of IR from cheap greens.
I was under the impression that it was never much more than 25-30% IR. Some are claiming 75% IR, 25% green, which I don't agree with at all. :tsk:
 

Asa

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I still think we need some definitive tests on exactly the % of IR from cheap greens.
I was under the impression that it was never much more than 25-30% IR. Some are claiming 75% IR, 25% green, which I don't agree with at all. :tsk:

And even in the case where it's more than 30% IR...


the IR is highly divergent.

...meaning it's not as collimated as the green light, so much of the IR light wouldn't even enter your eyes if you shine the laser straight at them (JUST AN EXAMPLE, DO NOT ATTEMPT THIS).
 

Bluefan

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Usually it's the problem that the goggles don't block IR, so it means you're not properly protected.
 

Ash

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Usually it's the problem that the goggles don't block IR, so it means you're not properly protected.
Right.
And, if you read my post above Post #4,
you would see that problem is easily solved by investing $42 on multi-wavelength protection glasses. :cool:
 

Asa

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Right.
And, if you read my post above Post #4,
you would see that problem is easily solved by investing $42 on multi-wavelength protection glasses. :cool:

Or, invest that money in a better laser with a nice IR filter. ;)
 




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