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Hild, S; Grote, H; Degallaix, J; Chelkowski, S; Danzmann, K; Freise, A; Hewitson, M; Hough, J; Lück, H; Prijatelj, M; Strain, K A; Smith, J R; Willke, B
Classical and quantum gravity, 03/2009, Volume: 26, Issue: 5Journal Article
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.
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