Reports until 17:16, Wednesday 15 August 2018
H1 SQZ (SQZ)
haocun.yu@LIGO.ORG - posted 17:16, Wednesday 15 August 2018 (43452)
Homodyne is ready!

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

Diodes Quantum Efficiency:

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:

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


Next step: