I put some optics to get the green SHG on the PSL table.
Now a green light successfully comes out from the doubling crystal.
Since the optical layout of the PSL table was dramatically changed, I had to re-setup the green SHG stuff.
- what I did
I put a steering mirror after the 90/10% pick off mirror, and then a half wave plate and a convex lens.
The lens is approximately on the right place.
To get the green beam easily, temporarily I raised the current of the NPRO up to 2 A.
I connected the oven to the heat controller, set the temperature to 36.8 deg which is the set point previously used.
After putting and aligning the oven, I finally obtained the green beam.
At the end of the work I set the NPRO current back to 0.9 A and relocked the PMC.
- things to be done
1. more precise mode matching
2. optimization of the temperature