I improved the mode matching of the incident beam to the doubling crystal on the PSL table.
As a result it apparently got better (i.e. brighter green beam), but it's not the best because now the beam is a little too tightly focused on the crystal.
I am going to work on it again someday after seeing the beat note signal.
- The measured waist sizes are
41.94 [um] for vertical mode
42.20 [um] for horizontal mode
while the optimum waist size is 50 um (see entry #3330).
The plot below shows the beam scan data which I took after improving the mode match.