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Journal Article

Pound-Drever-Hall error signals for the length control of three-port grating coupled cavities

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons40433

Britzger,  Michael
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40449

Friedrich,  Daniel
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons1456

Burmeister,  Oliver
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40437

Danzmann,  Karsten
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons40490

Schnabel,  Roman
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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ApplOpt50_4340.pdf
(Any fulltext), 650KB

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Citation

Britzger, M., Friedrich, D., Kroker, S., Brückner, F., Burmeister, O., Kley, E.-B., et al. (2011). Pound-Drever-Hall error signals for the length control of three-port grating coupled cavities. Applied Optics, 50(22), 4340-4346. doi:http://dx.doi.org/10.1364/AO.50.004340.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-0525-3
Abstract
Gratings enable light coupling into an optical cavity without transmission through any substrate. This concept reduces light absorption and substrate heating and was suggested for light coupling into the arm cavities of future gravitational wave detectors. One particularly interesting approach is based on all-reflective gratings with low diffraction efficiencies and three diffraction orders (three ports). However, it was discovered that, generally, three-port grating coupled cavities show an asymmetric resonance profile that results in asymmetric and low quality Pound–Drever–Hall error signals for cavity length control. We experimentally demonstrate that this problem is solved by the detection of light at both reflection ports of the cavity and the postprocessing of the two demodulated electronic signals.