June-gyu Park, Gyo-ik Kim, Chien Ming, Michael

We checked the status of the squeezer layout. The green was slightly misaligned to the OPO but it didn't require much change, and everything else seemed fine. We checked the SHG IR in vs green out, optimizing the PPLN crystal temperature at each different power input. There is a little optimization required at the 3rd significant figure of the temperature at each level of IR input power, which changes the output green power by about 10% or so. This kind of readjustment is normal for TAMA cavity nonlinear optics but it's interesting to see that this is also necessary for a waveguide crystal.

Takahashi-san gave us two tubes of Vac Seal from 20m lab which will be used to glue the OPO incoupling mirror to the replacement mount (during the last visit, we found that the mirror placed on the mount had the wedge orented vertically rather than horizontally). However, we couldn't find a spare mirror mount base (specialized for this OPO platform). 

Apparently the Taiwan group bought a huge batch of dichroics from LaserOptik. Hsun Chung will bring them to NAOJ on Thursday.

I took a couple of mirror mounts, a pack of post holders, some posts (30, 40mm) and a pack of set screws from the TAMA common supply to ATC. I also purchased a half inch mirror mount and two beam dumps for myself to use.