R&D (FilterCavity)
EleonoraCapocasa - 22:52, Wednesday 08 July 2020 (2109)
GREEN BS in reflection from FI changed

Yuhang, Eleonora

We changed the BS used to split the reflection of green FI FC lock PD and QPDs.

Before we were using a BS T 10 (70:30 for s-pol) and we replaced it with a BS X 10 (90:10 for s-pol).

Note that we are using p-pol so the actual ratios are different.

In the previous configuration we had 2 OD (0.5 and 0.6). Now we use only one OD (0.6) and the power is ~0.35 mW and the power reacing the pd is ~150 uW

We need to check FC PDH signal.