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Phys Rev Lett. 2004 Oct 15;93(16):161105. Epub 2004 Oct 15.

Squeezing in the audio gravitational-wave detection band.

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  • 1Center for Gravitational Physics, Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia.


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.

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