Participant: Eleonora and Yuhang

As we said during the last filter cavity meeting, the matching of s-pol inside OPO is becoming worse. Today we checked again and found something different. Especially we checked the shape of the first higher order mode. And another important effect is the higher order mode becomes higher after moving screws for yaw. All of these prove that the higher order mode is because of yaw misalignment.

Then we aligned s-pol and also p-pol. The alignment condition is taken as a photo and attached. The first one is for s-pol and the second one for p-pol.