[Aritomi, Yuhang]

First we maximized IR reflection from filter cavity while we couldn't find IR resonance at that point. The reflection was 84% of injection.

Then we aligned LO and BAB reflected by unlocked filter cavity into AMC and measured visibility.

Calculated visibility is somehow more than 100% but it should be good anyway. Good news is that visibility is stable although we have jittering.

Finally we measured squeezing spectrum when squeezed light is reflected by unlocked filter cavity (attached picture). Injected green is 40mW and demodulation phase for squeezing is 190deg. We have 1.8dB squeezing down to 60Hz. Since it seems we have much larger phase noise from filter cavity (It will be reported later), we may have more squeezing when pump green is lower. Large bump below 60Hz is unknown. Noise around 10kHz should be phase noise of laser since we turned it on today. 

Current problems:

1. Large bump below 60Hz

2. Large phase noise from filter cavity and CC2 control is not so stable