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Phys. Rev. Lett. 93, 161105 (2004) [4 pages]

Squeezing in the Audio Gravitational-Wave Detection Band

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Kirk McKenzie1, Nicolai Grosse1,2, Warwick P. Bowen2, Stanley E. Whitcomb3, Malcolm B. Gray1, David E. McClelland1, and Ping Koy Lam1,2
1Center for Gravitational Physics, Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia
2Quantum Optics Group, Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia
3LIGO Laboratory, California Institute of Technology, Pasadena, California, 91125, USA

Received 21 May 2004; published 15 October 2004

We demonstrate the generation of broadband continuous-wave optical squeezing from 280 Hz–100 kHz using a below-threshold optical parametric oscillator (OPO). The squeezed state phase was controlled using a noise locking technique. We show that low frequency noise sources, such as seed noise, pump noise, and detuning fluctuations, present in optical parametric amplifiers, have negligible effect on squeezing produced by a below-threshold OPO. This low frequency squeezing is ideal for improving the sensitivity of audio frequency measuring devices such as gravitational-wave detectors.


©2004 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.93.161105
DOI: 10.1103/PhysRevLett.93.161105
PACS: 04.80.Nn, 42.50.Lc, 42.65.Yj, 95.55.Ym

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