R&D (FilterCavity)
NaokiAritomi - 23:08, Wednesday 15 May 2019 (1352)
Replacement of flipping mirror for BAB and CC with 95:5 BS

[Aritomi, Yuhang, Chien-Ming]

We replaced a flipping mirror for BAB and CC with 95:5 BS since repeatability of the flipping mirror is not good. 95:5 BS is CVI PR1-1064-95-IF-2037-C. We put this BS so that 95% of BAB reflects and 5% of CC transmits. Instead of increasing the CC power, we removed ND1 and ND0.4 in CC path before the flipping mirror.

Then we tried to align CC and BAB to OPO. We found the resonance of CC, but the alignment of CC is not finished. We'll finish the alignment of CC and BAB tomorrow.

Comments related to this report
NaokiAritomi - 20:29, Tuesday 11 August 2020 (2158)
 
We measured reflection and transmission of 95:5 BS.
 
CC injection: 84 mW
CC reflection: 81.8 mW
CC transmission: 2.2 mW
 
This means this BS is not exactly 95:5, but 97.5:2.5.