DC-readout of a signal-recycled gravitational wave detector

Hild, S. 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)

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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.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Strain, Professor Kenneth and Hough, Professor James and Hild, Professor Stefan
Authors: Hild, S., Grote, H., Degallaix, J., Chelkowski, S., Danzmann, K., Freise, A., Hewitson, M., Hough, J., Luck, H., Prijatelj, M., Strain, K., Smith, J., and Willke, B.
College/School:College of Science and Engineering > School of Physics and Astronomy
Research Centre:College of Science and Engineering > School of Physics and Astronomy > Institute for Gravitational Research
Journal Name:Classical and Quantum Gravity
Publisher:Institute of Physics

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
459312Investigations in Gravitational Radiation.Sheila RowanScience & Technologies Facilities Council (STFC)ST/I001085/1Physics and Astronomy