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| Naoki Koyama, June Gyu Park, Yoichi Aso, Kentaro Somiya, Matteo Leonardi, Haoyu Wang | Naoki Koyama, June Gyu Park, Yoichi Aso, Kentaro Somiya, Matteo Leonardi, Marc Eisenmann, Haoyu Wang |
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| * The summary [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=14152|slide]] | * We performed a very preliminary alignment sensing simulation for birefringence with single arm cavity [[ https://gwdoc.icrr.u-tokyo.ac.jp/cgi-bin/private/DocDB/ShowDocument?docid=14152|slide]]. * Birefringence does not affect the operating point of the PDH error signal. * The birefringence in ITM will add distortion to the s-pol beam, introducing TEM01 (or TEM10) mode. This will generate an offset to the wavefront sensing error signal even though the cavity is well aligned. * This offset seems constant if the beam position on the ITM doesn't change. It probably can be compensated by looking at the transmission power of the cavity. * But when the beam position on the ITM changes, this offset will change. We need more accurate birefringence characterizations for KAGRA ITMs. |
Simulation meeting 2022 Jun 2 15:00
Zoom2: https://zoom.us/j/6676627462
Participants
Naoki Koyama, June Gyu Park, Yoichi Aso, Kentaro Somiya, Matteo Leonardi, Marc Eisenmann, Haoyu Wang
Agenda
Updates from Projects
- Birefringence simulation
We performed a very preliminary alignment sensing simulation for birefringence with single arm cavity slide.
- Birefringence does not affect the operating point of the PDH error signal.
- The birefringence in ITM will add distortion to the s-pol beam, introducing TEM01 (or TEM10) mode. This will generate an offset to the wavefront sensing error signal even though the cavity is well aligned.
- This offset seems constant if the beam position on the ITM doesn't change. It probably can be compensated by looking at the transmission power of the cavity.
- But when the beam position on the ITM changes, this offset will change. We need more accurate birefringence characterizations for KAGRA ITMs.