With some work on the homodyne unbalancing problem, finally the homodyne is working with visibility 97%.

Diodes Quantum Efficiency:

• PD1: Power in : 0.516mW; Readouts: -457mV; Dark: 100uV ----> QE = 1.034
• PD2: Power in : 0.513mW; Readouts: 452mV; Dark: 220uV ----> QE = 1.029

There are little mount of back reflections in the level of uW that are hard to measure, resulting in the >1 QE.

Note: These diodes are sensitive to the beam size and angle, which should be paid much attention.

Visibility:

• PD1: 97%;
• PD2: 97.4%

Thanks for Lee sending a new diode, and help from Marc on the circuits and board!

Next step:

• Focus on measuring the squeezing.
• OPO crystal position optimization and finalization.
• Double check dual resonance temperature without non-linear gain.
• OMC scan with SEED.