Sensing Optical Cavity Mismatch with a Mode-Converter and Quadrant Photodiode
arXiv:1909.08084 · doi:10.1103/PhysRevD.100.102001
Abstract
We present a new technique for sensing optical cavity mode mismatch and alignment by using a cylindrical lens mode converting telescope, radio-frequency quadrant photodiodes, and a heterodyne detection scheme. The telescope allows the conversion of the Laguerre-Gauss bullseye mode (LG01) into the 45deg rotated Hermite-Gauss ("pringle") mode (HG11), which can be easily measured with quadrant photodiodes. We show that we can convert to the HG basis optically, measure mode mismatched and alignment signals using widely produced radio-frequency quadrant photodiodes, and obtain a feedback error signal with heterodyne detection.
arXiv comment12 pages, 13 figures
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Cited by in corpus (5)
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- High Frame-Rate Phase Camera for High-Resolution Wavefront Sensing in Gravitational-Wave Detectors
- High-efficiency Electro-Optic Lens for radio frequency beam wavefront modulation for mode mismatch sensing