[Eleonora P., Eleonora C.]

We wanted to investigate the system performances after reducing CC power of a factor 10.

We locked the PLLs, the OPO and checked  the CC error signal in reflection from it.

We could see a demodulated signal (at 14 Mhz) when the green phase was scanned (10 Hz 1.5 Vpp as last time)  but the amplitude is quite small: ~10 mV. (see pic1)

The power of the CC beam (with OPO locked) just before the homodyne BS is 11.5 uW.

Then we wanted to proced with the shot nosie and squeezing measurement but we found out that the visibility (of LO and BAB) was very low.  So we confirmed that the aligment of the two beams into the AMC was poor but we managed to recovered it with some difficulties. (We followed the usual procedure: first we align LO with the two steering mirrors before AMC then we align BAB with the steering mirrors on the squeezing path after PBS.)

Current status:

- BAB flipping mirorr is on (BAB injected)

- Homodyne flip mirror is OFF to check alignement to AMC

- BAB and LO are aligned into AMC but visibility has to be re-measured

NOTE: We discovered that the fibered PD used for CC PLL monitor has a broken part (see pic2). This part is used to connect the PD the power supply insead of using battery. Since we don't have any spare we replaced it with a battery. Before leaving, we took the battery off to avoid consuming it. Remember to put battery in the PD if you want to check the CC beat note.