DC-readout of a signal-recycled gravitational wave detector

Hild, Stefan; Grote, Hartmut; Degallaix, Jerome; Chelkowski, S.; Danzmann, Karsten; Freise, A.; Hewitson, Martin; Hough, J.; Lück, Harald; Prijatelj, M.; Strain, Kenneth A.; Smith, J. R.; Willke, Benno

doi:10.1088/0264-9381/26/5/055012

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DC-readout of a signal-recycled gravitational wave detector

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

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

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

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

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Hewitson, Martin
Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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

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Prijatelj, M.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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Strain, Kenneth A.
Laser Interferometry & Gravitational Wave Astronomy, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society;

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

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Citation

Hild, S., Grote, H., Degallaix, J., Chelkowski, S., Danzmann, K., Freise, A., et al. (2009). DC-readout of a signal-recycled gravitational wave detector. Classical and Quantum Gravity, 26(5): 055012. doi:10.1088/0264-9381/26/5/055012.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0013-4504-0

Abstract

All first-generation large-scale gravitational wave detectors are operated at the dark fringe and use a heterodyne readout employing radio frequency (RF) modulation-demodulation techniques. However, the experience in the currently running interferometers reveals several problems connected with a heterodyne readout, of which phase noise of the RF modulation is the most serious one. A homodyne detection scheme (DC-readout), using the highly stabilized and filtered carrier light as a local oscillator for the readout, is considered to be a favourable alternative. Recently a DC-readout scheme has been implemented on the GEO 600 detector. We describe the results of first measurements and give a comparison of the performance achieved with homodyne and heterodyne readout. The implications of the combined use of DC-readout and signal recycling are considered.