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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 4 — Feb. 24, 2014
  • pp: 4224–4234

Balanced homodyne readout for quantum limited gravitational wave detectors

Peter Fritschel, Matthew Evans, and Valery Frolov  »View Author Affiliations

Optics Express, Vol. 22, Issue 4, pp. 4224-4234 (2014)

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Balanced homodyne detection is typically used to measure quantum-noise-limited optical beams, including squeezed states of light, at audio-band frequencies. Current designs of advanced gravitational wave interferometers use some type of homodyne readout for signal detection, in part because of its compatibility with the use of squeezed light. The readout scheme used in Advanced LIGO, called DC readout, is however not a balanced detection scheme. Instead, the local oscillator field, generated from a dark fringe offset, co-propagates with the signal field at the anti-symmetric output of the beam splitter. This article examines the alternative of a true balanced homodyne detection for the readout of gravitational wave detectors such as Advanced LIGO. Several practical advantages of the balanced detection scheme are described.

© 2014 Optical Society of America

OCIS Codes
(000.2780) General : Gravity
(120.2920) Instrumentation, measurement, and metrology : Homodyning
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(270.5570) Quantum optics : Quantum detectors
(270.6570) Quantum optics : Squeezed states

ToC Category:

Original Manuscript: November 6, 2013
Revised Manuscript: January 22, 2014
Manuscript Accepted: January 22, 2014
Published: February 18, 2014

Peter Fritschel, Matthew Evans, and Valery Frolov, "Balanced homodyne readout for quantum limited gravitational wave detectors," Opt. Express 22, 4224-4234 (2014)

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