Participant: Aritomi, Matteo, and Yuhang

We put two ND filters between the last steering mirror before OPO and the last lens before OPO. They are OD0.1 and OD 0.4. So it gives 10^-0.5 = 0.316 factor to both p-pol and coherent control beam.

The reason is to reduce the noise of coherent control OPO transmission coupled into the homodyne detector.