NaokiAritomi - 20:17, Wednesday 07 October 2020 (2232)
Trial to measure FDS with CCFC
[Aritomi, Yuhang]
We tried to measure FDS with CCFC with 42mW green. MZ offset is 4.5 and p pol PLL is 135 MHz for 42mW green. For 18mW green, MZ offset should be 4.2 and OD0.2 should be placed in pump injection path.
SR560 for CCFC: gain is 1000 and filter is 0.1Hz 1st order LPF.
We found that we can change the squeezing angle with CCFC, but with squeezing quadrature, the shot noise level is -123.8 dBm which is about 10 dB anti squeezing (attached picture). It seems CCFC makes the squeezing level worse a lot.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
We found that the squeezing angle can be changed by CC2 demodulation phase without CCFC, but
when CCFC is implemented, even when CC2 modulation phase changes, only anti squeezing appears. We don't know why.
Images attached to this report
