Aritomi and Yuhang

Today, we checked together about the polarization again with PBS plate.

• The mirror was mounted as flipped(the uncoated side was facing laser). We flipped it back to the correct side.
• The angle of the PBS plate was quite far from 45 deg. We checked today this angle. When we have all the light reflected, the angle was quite far from 45 deg(at that time, around 35 deg). When we turn the mirror to the direction of 45 deg, this reflection disappeared.

So we concluded that the beam we were using is p polarization. And we also need to pay attention next time about the surface of mirror and the angle of PBS plate.