Old 11-17-2011, 04:19 PM #1
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Default Nd:YAG crystal dont work

Hi,

i have green laser pointer.One day they stop to work.Ir diode was dead.I replace with new IR diode from 16x DVD burner.But they wont work.I only see dimmed red light on output lens.Where is problem?In IR diode or in Nd:YAG crystal.



Last edited by EXO; 11-17-2011 at 04:19 PM.
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Old 11-17-2011, 04:41 PM #2
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Default Re: Nd:YAG crystal dont work

That is probably a 780nm diode and not 808nm

500mW 808nm laser diode/TO-18(
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Old 11-17-2011, 04:57 PM #3
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Default Re: Nd:YAG crystal dont work

Actually your gain crystal is probably ND:YVO4, not ND:YAG. But regardless. It still won't work with a 780nm IR diode you find out of CD/DVD etc players. You need 808nm for the process to work.
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Old 11-17-2011, 04:58 PM #4
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Default Re: Nd:YAG crystal dont work

^^^^^ The wavelenght must be the same with the old diode.

Jim
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Old 11-17-2011, 06:24 PM #5
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Default Re: Nd:YAG crystal dont work

Dont look at the dim red dot
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Old 11-17-2011, 06:32 PM #6
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Default Re: Nd:YAG crystal dont work

Thanks for the answer.
What will be if I use red laser diode form dvd burner instead IR diode.Which color will be on output of crystal.
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Old 11-17-2011, 06:34 PM #7
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Default Re: Nd:YAG crystal dont work

Quote:
Originally Posted by EXO View Post
Thanks for the answer.
What will be if I use red laser diode form dvd burner instead IR diode.Which color will be on output of crystal.
Red

You need an 808nm diode to make a color change


4 bucks shipped

http://www.ebay.com/itm/808nm-300mW-...item4ab02731be
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Last edited by midias; 11-17-2011 at 06:34 PM.
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Old 11-17-2011, 06:35 PM #8
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Default Re: Nd:YAG crystal dont work

No it won't work. You need 808nm diode for the green lasers.
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Old 11-17-2011, 07:21 PM #9
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Default Re: Nd:YAG crystal dont work

Okay.Thanx for help.
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Old 11-18-2011, 03:04 AM #10
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Default Re: Nd:YAG crystal dont work

Only 808nm diodes will make your gain medium lase.
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