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Look at this DPSS crystal!

qumefox

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The easiest alignment method 'from scratch' that I can think of would likely be a similar process as i've used on badly misaligned argon-ion's before. Which is set up a fixed jig and use a second laser like a low power HeNe shining through the cavity through a piece of paper with a small hole in it.. and using the resulting reflections off each surface as a reference to get each component roughly parallel to the alignment beam. I know with argon-ions, this would get the mirrors close enough to have a beam again, then you just tweak for best output.. So i'd think it'd probably work for a DPSS as well.
 
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Misanthrop

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You probably would have had better luck had you left them in the housing they were in with the optics they had. When you took them out, you made things REALLY hard on yourself. For DPSS to work, you pretty much need the alignment of all the components of the system almost in perfect alignment to get anything out of it. Otherwise the optical losses will exceed the gain you get, and you get nothing.
The guy I bought it off (ebay) I think messed around with them also so I'm not any worse off.
 

BKarim

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"It seems like it should take 1 1064nm photon and split it"

Photons are not corpuscles but waves that propagates ( like riddles in surface of water ). In vacuum photons are just virtual particles (electrons and positrons) that oscillate and transmit their oscillation to other charged particles.

When the lasing wave oscillates in the lasing medium the atom's electrons start to oscillate at the same frequency than laser wave and a new "photon" is emitted in the same direction and same wavelength.
In non-linear crystals electrons just start to oscillate at 2x the rate (second harmonic) of the incident wave... (and also a little at 3x, 4x etc)
 
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