With Shingo

We removed the ND filters today.
After the work, we found the alignment changed a little, about 2 mm on ETM.
We adjusted the alignment by the picomotor in EXA chamber.

Then, we qualitatively looked at the scattered light from the PBS with an IR camera (ASI224MC) and a power meter(S121C).
The laser source power was set to be 10W.
I attached an IR camera picture which shows the PBS shines very brightly.
We also held our power meter up around the PBS and got readings of about 1 mW, depending on the position.
(The distance between the power meter and the PBS was roughly 4-5 cm.)
These results indicate the scattered light is not so small, and can have several % with a very rough calculation.