[Aritomi, Yaochin]
First we checked visibility. Visibility is 98.2% and loss from visibility is 3.5% as follows. This is a bit worse than before and we should improve mode matching of BAB.
| maximum | 648 mV |
| minimum | 120 mV |
| LO | 336 mV |
| BAB | 64 mV |
| offset | 6.4 mV |
| visibility | 98.2% |
| visibility^2 | 96.5% |
Then we found that loss from dichroic mirror is 6.7% and loss from PBS is 2.1% as follows. It's strange that loss from dichroic mirror is so large.
| before dichroic mirror | 464 uW |
| after dichroic mirror | 433 uW |
| before PBS | 331 uW |
| after PBS | 324 uW |
Tomorrow we'll align dichroic mirror and replace PBS with HR mirror. The method to align dichroic mirror is to send only BAB to scanned OPO and put HR mirror just after dichroic mirror and maximize the reflection.