NAOJ GW Elog Logbook 3.2
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YuhangZhao - 20:28, Tuesday 18 May 2021 (2512)
FDS measurement with AA/pointing/BScontrol
Aritomi, Michael, Yuhang
We tried to optimize filter cavity reflection mode matching to homodyne LO. Now it is about 5%, which is still larger than last year.
After that, we tried to measure FDS. Considering a reasonable degradation budget, we did a fit for all the measurements.
We found ~3.3dB squeezing above rotation frequency, but almost no squeezing was observed below rotation frequency.
The degradation parameters:
squeezing level: 11.2dB
round trip loss: 120ppm
total optical loss: 38%
Matching to filter cavity: 5%
Matching to local oscillator: 5%
Locking accuracy: 5e-12m
phase noise: 30mrad
sqz_dB = 11.2;%8.3; % produced SQZ
L_rt = 120e-6; % FC losses
L_inj = 0.38; % Injection losses
L_ro = 0.0;%0.05; % Readout losses
A0 = 0.05;%0.06; % Squeezed field/filter cavity mode mismatch losses
C0 = 0.05;%0.02; % Squeezed field/local oscillator mode mismatch losses
ERR_L = 5e-12; % Lock accuracy [m]
ERR_csi = 30e-3;
sqz_dB = 11.2;%8.3; % produced SQZ
L_rt = 120e-6; % FC losses
L_inj = 0.38; % Injection losses
L_ro = 0.0;%0.05; % Readout losses
A0 = 0.05;%0.06; % Squeezed field/filter cavity mode mismatch losses
C0 = 0.05;%0.02; % Squeezed field/local oscillator mode mismatch losses
ERR_L = 5e-12; % Lock accuracy [m]
ERR_csi = 30e-3;
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