[Aritomi, Yuhang]

From previous measurement, dichroic mirror we are using (HBSY11) had only 96% reflectivity while the spec reflectivity is 99.3%. We tweaked angle of the dichroic mirror and measured BAB peak height when OPO is scanned. We improved the reflection by 4% from 95.2mV to 99.2mV. However, the optimal angle is not 45deg and we lose 18% of BAB at PBS after OPO with this angle of dichroic mirror. We tried to change the angle of the PBS by hand, but it didn't improve. We need to align the PBS.