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Can you help me spot the IR filter?

anirbanbob

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I bought a Q-Switched laser recently and opened it up. The picture is attached. I want to remove the IR filter that lets only 532nm pass through. I tried to guess most of the components in there (might not be correct about few of them), what I am most concerned with is localizing the IR filter. Can you please help confirm which one it is?

IMG_2703.jpg
 



paul1598419

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It may not have an IR filter at all. The OC can be made to pass only 532nm, so that is more likely.
 

anirbanbob

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So is the titled mirror like thing an output coupler? So if I remove that, I should get the green+IR out as well?
 

paul1598419

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You will get nothing. The output coupler mirror is necessary for any laser action except for the 808nm pump diode array.
 

anirbanbob

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Got it. I think the bench generates 1064nm that is doubled by the KTP. Can I get 1064nm output with the 532nm by removing any component in the bench? Looking for an IR output along with the green, so doesn't have to be the 808nm.
 

paul1598419

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Your YAG or vanadate crystal produces the 1064nm line and the nonlinear crystal doubles the frequency of the light, but I am not familiar enough with this particular laser to know exactly all the components in it.
 

Encap

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Should be able to contact the manufacturer and ask--it may not have any IR filter as others have mentioned.

Not likely you get IR + green beams out of it---maybe one or the other, just IR if you remove the doubling crystal that outputs green, and reconfigure components but not both. It is meant to be a 532nm green, yes? .
Why do you want/need IR + green?
 
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diachi

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There won't be much IR coming out of it. That output coupler is very likely high reflect at 1064nm. Removing it would stop the laser from working.

Picture with beam path labeled.

Purple: 808nm
Red: 1064nm
Yellow: 1064nm+532nm
Green: 532nm.

 




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