Local readout enhancement for detuned signal-recycling interferometers

Abstract

Motivated by the optical-bar scheme of Braginsky, Gorodetsky and Khalili, we propose to add to a high power detuned signal-recycling interferometer a local readout scheme which measures the motion of the arm-cavity front mirror. At low frequencies this mirror moves together with the arm-cavity end mirror, under the influence of gravitational waves. This scheme improves the low-frequency quantum-noise-limited sensitivity of optical-spring interferometers significantly and can be considered as a incorporation of the optical-bar scheme into currently planned second-generation interferometers. On the other hand it can be regarded as an extension of the optical bar scheme. Taking compact-binary inspiral signals as an example, we illustrate how this scheme can be used to improve the sensitivity of the planned Advanced LIGO interferometer, in various scenarios, using a realistic classical-noise budget. We also discuss how this scheme can be implemented in Advanced LIGO with relative ease.

References in corpus (2)

• Coherent control of vacuum squeezing in the Gravitational-Wave Detection Band
• Measurement of Optical Response of a Detuned Resonant Sideband Extraction Interferometer

Cited by in corpus (6)

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• Engineering the Optical Spring via Intra-Cavity Optical-Parametric Amplification
• Enhancing the force sensitivity of squeezed light optomechanical interferometer
• Back-Action Evading Measurement in Gravitational Wave Detectors to Overcome Standard Quantum Limit, Using Negative Radiation Pressure
• Quantum speed limit as a sensitive probe of Planck-scale effects