title: Squeezing in the audio gravitational-wave detection band.
abstract: 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.
authors.affiliation: Center for Gravitational Physics, Department of Physics, Faculty of Science, The Australian National University, ACT 0200, Australia.
authors.forename: Kirk
authors.initials: K
authors.lastname: McKenzie
authors.forename: Nicolai
authors.initials: N
authors.lastname: Grosse
authors.forename: Warwick P
authors.initials: WP
authors.lastname: Bowen
authors.forename: Stanley E
authors.initials: SE
authors.lastname: Whitcomb
authors.forename: Malcolm B
authors.initials: MB
authors.lastname: Gray
authors.forename: David E
authors.initials: DE
authors.lastname: McClelland
authors.forename: Ping Koy
authors.initials: PK
authors.lastname: Lam