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| * 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. |
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 singele 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.