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.
Keywords
Cite
@article{arxiv.0705.2987,
title = {Local readout enhancement for detuned signal-recycling interferometers},
author = {Henning Rehbein and Helge Mueller-Ebhardt and Kentaro Somiya and Chao Li and Roman Schnabel and Karsten Danzmann and Yanbei Chen},
journal= {arXiv preprint arXiv:0705.2987},
year = {2008}
}