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R&D (FilterCavity)
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YuhangZhao - 20:28, Tuesday 18 May 2021 (2512)Get code to link to this report
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;   
Images attached to this report
2512_20210518132842_untitled.png