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arXiv · 0705.2987

Local readout enhancement for detuned signal-recycling interferometers

Henning Rehbein·Helge Mueller-Ebhardt·Kentaro Somiya·Chao Li·Roman Schnabel·Karsten Danzmann·Yanbei Chen
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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.

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Henning Rehbein, Helge Mueller-Ebhardt, Kentaro Somiya, Chao Li, Roman Schnabel, Karsten Danzmann, Yanbei Chen. 2007-08-22. Local readout enhancement for detuned signal-recycling interferometers. https://doi.org/10.1103/physrevd.76.062002

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