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arXiv · 0805.3096

Double optical spring enhancement for gravitational wave detectors

Henning Rehbein·Helge Mueller-Ebhardt·Kentaro Somiya·Stefan L. Danilishin·Roman Schnabel·Karsten Danzmann·Yanbei Chen
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Abstract

Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling (SR) technique. Candidate Advanced LIGO configurations are usually designed to have two resonances within the detection band, around which the sensitivity is enhanced: a stable optical resonance and an unstable optomechanical resonance - which is upshifted from the pendulum frequency due to the so-called optical-spring effect. Alternative to a feedback control system, we propose an all-optical stabilization scheme, in which a second optical spring is employed, and the test mass is trapped by a stable ponderomotive potential well induced by two carrier light fields whose detunings have opposite signs. The double optical spring also brings additional flexibility in re-shaping the noise spectral density and optimizing toward specific gravitational-wave sources. The presented scheme can be extended easily to a multi-optical-spring system that allows further optimization.

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Henning Rehbein, Helge Mueller-Ebhardt, Kentaro Somiya, Stefan L. Danilishin, Roman Schnabel, Karsten Danzmann, Yanbei Chen. 2008-05-20. Double optical spring enhancement for gravitational wave detectors. https://doi.org/10.1103/physrevd.78.062003

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