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New experiment for green laser

trinh hong phuoc

trinh hong phuoc

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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?
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CurtisOliver

CurtisOliver

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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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Radim

Radim

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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).
 
diachi

diachi

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CurtisOliver said:
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.
Click to expand...

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.


Richie89 said:
Just replace the IR laser with a 2W C-mount 808nm. j/K
:lasergun:
Click to expand...

You smell that? Smells like Nd:YVO4 burning! :D:D
 
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