Chien-Ming, Hsun-Chung, Te-Hui, Logan, Michael

The wedge angle for the VOPO cavity mirrors was not so easy to see. It turns out the mechanical fixtures holding one of the mirrors had to be filed off because it didn't have enough clearance. The mirror was taken to the elec shop with First Contact. The Taiwan group will fabricate a new set of cavity mirrors which they will replace "next time" (October or November).

Eventually the cavity mirrors were placed as they are for now. The other First Contact on the OPO was peeled off. Chien-Ming then tought me the procedure to align and mode-match the bowtie OPO. After a few false starts I eventually managed to get it to 80% with just LG mode remaining. Then it was getting late.

After achieving green resonance, we must get IR resonance, green/IR coresonance and then maximize amplification/deamplification by adjusting the lateral position of the wedged PPKTP. This is the same nonlinear gain measurement principle as before. We actuate on the relative phase of bright IR and green using a PZT phase shifter (in this case we will use on IR path but in TAMA we do it on green), allowing us to see the full range of nonlinear amplification/deamplification.

I returned the Vac Seal back to the TAMA South End dessicator.