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          Institute: MPI für Gravitationsphysik     Collection: Laser Interferometry & Gravitational Wave Astronomy     Display Documents



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ID: 410467.0, MPI für Gravitationsphysik / Laser Interferometry & Gravitational Wave Astronomy
DC-readout of a signal-recycled gravitational wave detector
Authors:Hild, S.; Grote, Hartmut; Degallaix, Jerome; Chelkowski, S.; Danzmann, Karsten; Freise, A.; Hewitson, Martin; Hough, J.; Lück, Harald; Prijatelj, M.; Strain, K. A.; Smith, J. R.; Willke, Benno
Date of Publication (YYYY-MM-DD):2009-03-07
Title of Journal:Classical and Quantum Gravity
Volume:26
Issue / Number:5
Sequence Number of Article:055012
Review Status:not specified
Audience:Not Specified
Abstract / Description: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.
External Publication Status:published
Document Type:Article
Communicated by:Karsten Danzmann
Affiliations:MPI für Gravitationsphysik/Teilinstitut Hannover
MPI für Gravitationsphysik/Laser Interferometry & Gravitational Wave Astronomy
Identifiers:ISSN:0264-9381
DOI:10.1088/0264-9381/26/5/055012
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