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Old 07-11-2017, 02:45 AM #1
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Default New experiment for green laser

I removed the IR diode from the green laser module. If I replaced it with a red lpc 836 diode, what would be the result?[IMG][IMG][/IMG][/IMG]


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Old 07-11-2017, 02:45 AM #2
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Default Re: New experiment for green laser

Quote:
Originally Posted by trinh hong phuoc View Post
I removed the IR diode from the green laser module. If I replaced it with a red lpc 836 diode, what would be the result?[IMG][IMG][/IMG][/IMG]
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Old 07-11-2017, 05:37 AM #3
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Default Re: New experiment for green laser

You wont have any output.
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Old 07-11-2017, 05:43 AM #4
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Default Re: New experiment for green laser

Quote:
Originally Posted by Mosc007 View Post
You wont have any output.

What happens when I replace the ir laser diode with a red laser diode?Experiment has not been tested yet:làn sóng::làn sóng:
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Old 07-11-2017, 05:46 AM #5
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Default Re: New experiment for green laser

Your laser is a DPSS. You have two crystals in there. The first is a Nd:YAG which outputs 1064nm and the second is the KTP doubling crystal. Now Nd:YAG's major absorption line is at 808nm. The same wavelength as the IR diode you have extracted. It doesn't however accept 650nm, so it won't produce no output at all. So the first crystal will not have enough gain to produce the needed 1064nm for the KTP to double in order to output 532nm.

Edit: The reason why it has not been tested yet is because we already understand the process enough to know it won't work.
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Old 07-11-2017, 05:47 AM #6
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Default Re: New experiment for green laser

The Crystals and Frequency double only work if you pump them with the correct wavelength.
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Old 07-11-2017, 06:03 AM #7
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Default Re: New experiment for green laser

Interesting post some pics if it works,
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Old 07-11-2017, 06:27 AM #8
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Default Re: New experiment for green laser



Source (paid): http://iopscience.iop.org/article/10...ce.cld.iop.org
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Old 07-11-2017, 06:38 AM #9
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Default Re: New experiment for green laser

Good graph Radim. As you can see the line is pretty much flat at 650nm. You won't get any emission.
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Old 07-11-2017, 07:39 AM #10
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Default Re: New experiment for green laser

Thanks, Oliver.

BTW: From emission spectrum it is visible why other beautiful visible wavelengths compared to 532 nm (from 1064 nm) are so inefficient to produce - especially 473 nm (from 946 nm). Also due to many emission lines and frequency doubling (and sum frequency doubling) processes it is nicely visible why Nd dopped crystals are used to produce so many awesome wavelengths in this solid state laser (therefore with larger cavity, better beam specs are reached compared to semiconductor - diode lasers).
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Old 07-11-2017, 09:03 AM #11
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Default Re: New experiment for green laser

Precisely Radim.
1064 is the dominant wavelength.
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Old 07-11-2017, 09:08 AM #12
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Default Re: New experiment for green laser

Thanks indeed for sharing that graph Radim

-Alex
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Old 07-11-2017, 11:19 AM #13
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Default Re: New experiment for green laser

Quote:
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What happens when I replace the ir laser diode with a red laser diode?Experiment has not been tested yet:làn sóng::làn sóng:
If you also remove the Crystals you will have
a Red Laser....

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Default Re: New experiment for green laser

Crystal clear thinking Jerry.
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Old 07-11-2017, 11:25 AM #15
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Default Re: New experiment for green laser

Just replace the IR laser with a 2W C-mount 808nm. j/K
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Old 07-11-2017, 02:36 PM #16
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Default Re: New experiment for green laser

Quote:
Originally Posted by CurtisOliver View Post
Your laser is a DPSS. You have two crystals in there. The first is a Nd:YAG which outputs 1064nm and the second is the KTP doubling crystal. Now Nd:YAG's major absorption line is at 808nm. The same wavelength as the IR diode you have extracted. It doesn't however accept 650nm, so it won't produce no output at all. So the first crystal will not have enough gain to produce the needed 1064nm for the KTP to double in order to output 532nm.

Edit: The reason why it has not been tested yet is because we already understand the process enough to know it won't work.
It probably isn't Nd:YAG actually, most, if not all modern pointers use Nd:YVO4 for 1064nm.

But yeah... won't work. You'd get some red out of the front, but it won't be a nice spot and won't be collimated well at all.


Quote:
Originally Posted by Richie89 View Post
Just replace the IR laser with a 2W C-mount 808nm. j/K
You smell that? Smells like Nd:YVO4 burning!
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Last edited by diachi; 07-11-2017 at 02:42 PM.
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