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masayuki.nakano - 20:13, Wednesday 08 August 2018 (5754)Get code to link to this report
Beam jitter and RIN coupling

[Tahara, Sakakibara, Nakano]

We found that the beam jitter converted to the intensity fluctuation by the PMC. The attached figure is the spectrums and the coherence of the intensity fluctuation of the output beam from the PMC and the beam jitter of the injection light to the PMC. The beam jitter was measured by the QPD. It has a coherence with the yaw motion. We will investigate more about this problem.

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kiwamu.izumi - 06:38, Thursday 09 August 2018 (5759)

Hey Masayuki,

This is interesting. I have a couple of questions:

  • Could this just be an indication that the input light is horizontally and statically misaligned with respect to the PMC?
  • Is there any chance that the intensity and beam jitter were already coherent even before the light enters the PMC?