R&D (FilterCavity)
NaokiAritomi - 21:18, Monday 10 December 2018 (1143)
Lock of IRMC

[Aritomi, Yuhang]

Here is information of lock of IRMC.

Input power: 2 mW, output power: 1.56mW (transmissivity: 78%)
Filter for lock of IRMC:
SR560 with low-pass 30 Hz, gain 10
40dB attenuation

We put an half-wave plate on the path before homodyne BS to get p-pol.

Then we measured reflection and transmission from BS for homodyne detector.
Reflection: 0.74mW, Transmission: 0.82mW
BS (BSW41-1064) somehow does not split the beam half and half now.

Comments related to this report
MatteoLeonardi - 16:14, Tuesday 11 December 2018 (1144)
According to Thorlabs specs, that component should have (at 1064nm and AOI = 45deg) R= 49.14513016% (ppol) and T= 50.49834442% (ppol)