[Aritomi, Yaochin]

We removed old faraday and aligned IR to filter cavity. Current mode matching is 86% as follows.

We found that IR transmission with parametric amplification is more stable than before as attached movie. We also know that IR transmission is stable without parametric amplification. So IR fluctuation is related to parametric amplification and replacement of faraday. We suspect that IR fluctuation we had before came from back reflection although we have two faradays. Isolation ratio of new/old faraday is almost same (38dB), but new faraday is closer to OPO and this may reduce back reflection from optics between old and new faraday.

We'll make GR and IR overlap next week.