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Double Optical Spring Enhancement for Gravitational Wave Detectors by Rehbein, Henning; Mueller-Ebhardt, Helge; Somiya, Kentaro; Danilishin, Stefan L.; Schnabel, Roman; Danzmann, Karsten; Chen, Yanbei is a scholarly article available to read on EtoBox.

What is Double Optical Spring Enhancement for Gravitational Wave Detectors about?

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.

Author

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

Published

2008

Language

EN