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Old 09-14-2016, 05:11 AM #1
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Default 405nm glasses question

Hey all,
Just made my first laser, which was a 532nm 100mw one, with cable ties and twisting the wire.
I just ordered this one: https://www.aliexpress.com/item/250m...4d5acc69&tpp=1

And wish to know what glasses i should be using for it. Currently for my green one, i am using a cheap 5 dollar pair, but i cant see the beam with them on, only a dot, so i take them off briefly to look. What cheap glasses protect me from 405nm, and it is my understanding they do not have IR, so i dont need to worry about that?
Thanks for your time.


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Old 09-14-2016, 09:17 AM #2
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Default Re: 405nm glasses question

Cheap goggles (especially from eBay) shouldn't be used for anything over 100mW, since they can't always be trusted.

For any laser >~80mW-100mW, I would strongly recommend goggles that are at least CE certified with good reviews.

These goggles, while not exactly in the same price range as eBay goggles, are highly recommended by myself and other users here. They are CE certified to be OD 4+ within the 190nm-540nm spectrum. They will protect you from all violet, blue, and the majority of green lasers up to about 10W.

As for IR, it is not an issue with direct diode lasers. IR only becomes an issue when dealing with solid-state lasers. While 405nm is a diode wavelength, 532nm is not. 532nm lasers are solid-state lasers, meaning that unless you built your laser with an IR-filter, there is a good chance that there is some IR leakage that your goggles are not protecting you from.
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Old 09-14-2016, 10:04 AM #3
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Default Re: 405nm glasses question

Thanks! I'll purchase them when i am near getting the laser delivered. Thanks for your help



Quote:
Originally Posted by H2Oxide View Post
Cheap goggles (especially from eBay) shouldn't be used for anything over 100mW, since they can't always be trusted.

For any laser >~80mW-100mW, I would strongly recommend goggles that are at least CE certified with good reviews.

These goggles, while not exactly in the same price range as eBay goggles, are highly recommended by myself and other users here. They are CE certified to be OD 4+ within the 190nm-540nm spectrum. They will protect you from all violet, blue, and the majority of green lasers up to about 10W.

As for IR, it is not an issue with direct diode lasers. IR only becomes an issue when dealing with solid-state lasers. While 405nm is a diode wavelength, 532nm is not. 532nm lasers are solid-state lasers, meaning that unless you built your laser with an IR-filter, there is a good chance that there is some IR leakage that your goggles are not protecting you from.
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Old 09-14-2016, 01:56 PM #4
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Default Re: 405nm glasses question

Quote:
Originally Posted by H2Oxide View Post
Cheap goggles (especially from eBay) shouldn't be used for anything over 100mW, since they can't always be trusted.

For any laser >~80mW-100mW, I would strongly recommend goggles that are at least CE certified with good reviews.

These goggles, while not exactly in the same price range as eBay goggles, are highly recommended by myself and other users here. They are CE certified to be OD 4+ within the 190nm-540nm spectrum. They will protect you from all violet, blue, and the majority of green lasers up to about 10W.

As for IR, it is not an issue with direct diode lasers. IR only becomes an issue when dealing with solid-state lasers. While 405nm is a diode wavelength, 532nm is not. 532nm lasers are solid-state lasers, meaning that unless you built your laser with an IR-filter, there is a good chance that there is some IR leakage that your goggles are not protecting you from.
OP, those goggles are a good choice. They are still rather cheap as far as certified goggles go but they will help keep you safe.

H2O, diode lasers are also solid state lasers. Anything that has a gain medium in the solid phase is a solid state laser. I think you're confusing the term with "diode pumped solid state" or DPSS lasers, which are also solid state but are "pumped" by (typically) an IR laser. But you are correct - there is no IR laser radiation from 405nm diodes.
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Last edited by diachi; 09-14-2016 at 01:57 PM.
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Old 09-14-2016, 09:07 PM #5
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Default Re: 405nm glasses question

Quote:
Originally Posted by diachi View Post
H2O, diode lasers are also solid state lasers. Anything that has a gain medium in the solid phase is a solid state laser. I think you're confusing the term with "diode pumped solid state" or DPSS lasers, which are also solid state but are "pumped" by (typically) an IR laser. But you are correct - there is no IR laser radiation from 405nm diodes.
Technically, you are correct. But I think Wikipedia puts it nicely:
Quote:
A solid-state laser is a laser that uses a gain medium that is a solid, rather than a liquid such as in dye lasers or a gas as in gas lasers. Semiconductor-based lasers are also in the solid state, but are generally considered as a separate class from solid-state lasers (see Laser diode).
If diode lasers were classified as solid-state lasers, then an OPSL would be classified as a DPSSL.
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