Do you understand why its configured as a "W" fold? There are very valid reasons for that. Converting it to linear will seriously rob you of power and performance. The V fold locates the crystal at a focal point inside the cavity to increase conversion of 1064 to Green, which is a roughly Quadratic function of energy density in the crystal. There are other more technical reasons as well.
A "W" is not just a linear cavity folded. It looks that way but there is a complex three dimensional ballet going on inside. The focal length of the mirrors matter. I'd have to measure all the focal lengths and run a stability calculation to see if it would work at all, and that does not in the least compensate for thermal lensing in the rod.
Designing DPSS lasers is a bit of an art. Simple brute force methods of a short cavity will get you SOME green, but at some horrible tradeoffs.
What is labeled a "polarizer", is depending on the design, usually a Quarter or Half Wave plate, this is to allow control of the polarization in the crystal. Thus you would also likely have to machine a new KTP mount, to match the polarization states.
Then buy quite a few adjustable mirror mounts. Usually just removing the epoxy that holds the mirrors will crack at least one of them beyond use. Its a ceramic loaded stable epoxy, and its good to 250'C or more. Its very solvent resistant. So if you bake it off you often end up contaminating the coatings from vapors, if it will bake off at all. In my experience it turns to a hard cement before it fractures, when baking.
That laser cost 12,000$ new for quantity one in 1990s Dollars, when they first came on the market. You can bet its already optimized for best beam quality and power.
Considering what it is, there are a lot of people here who would rather buy it from you and let you go get what you want to play with. For 200-250$ of parts on Ebay, You'd have a better chance of getting green photons with a two mirror short cavity.
If you do work on it, you need protective goggles for three wavelengths. 808, 1064, and 532.
I service solid state and gas lasers for a living. I have a friend who repairs those for medical use. He calls me all the time for advice about adjusting those when the elements are damaged or worn out. He's very good at alignment(20 years of doing that) and he struggles with Half Notes. Heed my warning. There are less then 10 people on this forum who could take that apart and get it back to spec power. Of those, 5 of them could reconfigure it for "some" green.
Steve
Last edited by mixedgas; 01-05-2015 at 06:47.
Qui habet Christos, habet Vitam!
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When I still could have...