Old 07-08-2018, 06:44 PM #1
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Default 520 nm diode-won't need Infrared Goggle-more efficient than 532?

Hi

I am new to the hobby-I've been reading about DPSS vs direct diodes and if I read correctly, the 532 nm are DPSS and get to 532 nm via 1064 nm infrared (which is also why cheap 532 nm put out an invisible infrared beam-no filter).

I have a 520 nm 1 Watt (Challenger 2( being built by Sanwu- as I understand it (could be wrong) 520 nm diodes are direct-not using 1064 and a 2X frequency (divider?). So my Eagle 6 OD 190-540 should suffice?

It will use a single 18650 battery (I already have a collection from "lesser lasers" (IE 303, and "1Watt Gatling host 532 nm"-which judging from it's weak burning is likely far less).

Am I mistaken in thinking the 520 nm are more efficient than the 532?
I assume (from reading) that the 532 nm "1 watt Gatling" is less than 150 mwatt. It will light a BLACK match head-when I make a focal point- at roughly 4-6 inches-in 10 seconds or so. I am guessing I should never do that again-without 1064 nm protection!



Last edited by Pelagius; 07-08-2018 at 06:57 PM. Reason: added
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Old 07-08-2018, 06:54 PM #2
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Default Re: 520 nm diode-won't need Infrared Goggle-more efficient than 532?

Those goggles will work, 520nm lasers use diodes which don’t produce ir. 532nm lasers are dpss, they require a strong 808nm pump which pumps Nd:YAG or Nd:YV04. These lase at 1064 which is then frequency doubled to 532. This process is not 100% efficient, so it typically a class 4 pump diode to produce a class 3 or 3b 532nm.

Those gatling lasers are poor quality, that “1W” 532 is most likely <200mW. Sanwu and jetlasers are good options for high quality lasers.
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Last edited by Gazen; 07-08-2018 at 06:58 PM.
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Old 07-08-2018, 07:20 PM #3
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Default Re: 520 nm diode-won't need Infrared Goggle-more efficient than 532?

Quote:
Originally Posted by Pelagius View Post
Hi

I am new to the hobby-I've been reading about DPSS vs direct diodes and if I read correctly, the 532 nm are DPSS and get to 532 nm via 1064 nm infrared (which is also why cheap 532 nm put out an invisible infrared beam-no filter).

I have a 520 nm 1 Watt (Challenger 2( being built by Sanwu- as I understand it (could be wrong) 520 nm diodes are direct-not using 1064 and a 2X frequency (divider?). So my Eagle 6 OD 190-540 should suffice?

It will use a single 18650 battery (I already have a collection from "lesser lasers" (IE 303, and "1Watt Gatling host 532 nm"-which judging from it's weak burning is likely far less).

Am I mistaken in thinking the 520 nm are more efficient than the 532?
I assume (from reading) that the 532 nm "1 watt Gatling" is less than 150 mwatt. It will light a BLACK match head-when I make a focal point- at roughly 4-6 inches-in 10 seconds or so. I am guessing I should never do that again-without 1064 nm protection!

Wear appropriate eye protection when working with any laser over 5mw, as for ir leakage that is something you will have to determine for yourself, it's your responsibility to protect your eyes and lase safely no matter what anyone may tell you it is your responsibility, now I will say that typically ir leakage is not a big issue but again it's your responsibility so by all means wear the extra pair of safety glasses if in doubt.
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Last edited by RedCowboy; 07-08-2018 at 07:26 PM.
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Old 07-08-2018, 07:56 PM #4
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Default Re: 520 nm diode-won't need Infrared Goggle-more efficient than 532?

Neither the 532nm DPSS laser nor the 520nm direct diode laser is very efficient. While it is true the 520nm doesn't have an IR component, the amount of IR leakage from a typical 532nm laser is very small. This can be seen on a good optical spectrometer where you can see the relative heights of the primary peak and the IR peaks. Regardless, you only have two eyes and need them both to see depth, so goggles are a must have.
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Old 07-09-2018, 12:10 AM #5
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Default Re: 520 nm diode-won't need Infrared Goggle-more efficient than 532?

Thanks Gazen, Redcowboy, and Paul

Quote:
Originally Posted by paul1598419 View Post
Neither the 532nm DPSS laser nor the 520nm direct diode laser is very efficient. While it is true the 520nm doesn't have an IR component, the amount of IR leakage from a typical 532nm laser is very small. This can be seen on a good optical spectrometer where you can see the relative heights of the primary peak and the IR peaks. Regardless, you only have two eyes and need them both to see depth, so goggles are a must have.
Thanks Paul-your advice is why I went ahead and bought the Eagle 190-540. from Survival Laser-and read many threads on safety on the forum. From what I've read the 520 should not emit IR since there is no 808 to 1063-to 520 conversion.

Quote:
Originally Posted by RedCowboy View Post
Wear appropriate eye protection when working with any laser over 5mw, as for ir leakage that is something you will have to determine for yourself, it's your responsibility to protect your eyes and lase safely no matter what anyone may tell you it is your responsibility, now I will say that typically ir leakage is not a big issue but again it's your responsibility so by all means wear the extra pair of safety glasses if in doubt.
Good practice-I'm pretty sure I'll opt to get the Eagle with added IR protection-particularly since I'm pretty sure I am hooked-and will get more.
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