[Izumi, Matteo, Sugimoto, Yokogawa]
IR path from the Prometheus laser
We put IR optics for X-arm.
- Transmittance of the Faraday Isolator was about 94% (Input:399.2mW, Trans:375.2mW).
- I forgot to place HWP in front of the Faraday Isolator in my layout design, so we must buy additional HWP for 1064nm (x2).
- I forgot to place beam dumps for the Faraday Isolator in my layout design, so we must buy additional beam dumps.
The optical fiber for 532nm
- The coupling rate of the fiber was 63% yesterday, but it reached only 46% (Input:24.8mW, output:11.3mW).
- The beam power after the EOM was about 25mW today. (I remember it was about 70mW yesterday.)
There are the following possible cause.
- Mode match to the fiber is not good. (I tried to tune the position of L4 but there was no improvement.)
- misalignment of the AOM and theEOM
MEMO
We moved the Prometheus laser from the POP table to PSL