Reports until 17:32, Tuesday 13 November 2018
H1 SQZ (SQZ)
haocun.yu@LIGO.ORG - posted 17:32, Tuesday 13 November 2018 - last comment - 09:21, Thursday 15 November 2018(45261)
VOPO Alignment and Mode Matching

[Sheila, Fabrice, Nutsinee, Terry, Haocun]

Summary:

We have OPO coupling 89% 00 mode, alignment >~95%, mode matching >~95% and polarization mode ~2%.

I will add more details with numbers later.

Comments related to this report
haocun.yu@LIGO.ORG - 11:51, Wednesday 14 November 2018 (45276)
Link

Detailed measurements:

These numbers are the best ones we tried to take because the signal was noisy in air.

  • 00 mode peak: 387.5mV (max: 441; min: 344)
  • Polarization mode: 87mV
  • 10 mode (misalignment): 92~93.6mV
  • 20 mode (mis-mode matching): 92mV
  • Dark noise: 78mV

 

Calculation:

  • 00 mode: 89%
  • Polarization mode: 2.6%
  • Misalignment: 4.5%
  • Mis-mode matching: 4% (Mode matching efficiency = 96%)

 

nutsinee.kijbunchoo@LIGO.ORG - 09:21, Thursday 15 November 2018 (45303)
Link

Here's a picture of the scan. Will go back and save the data properly later.

Images attached to this comment