LIGO Document P080041-x0

Double optical spring enhancement for gravitational-wave detectors

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P - Publications
Currently planned second-generation gravitational-wave laser interferometers such as Advanced LIGO exploit the extensively investigated signal-recycling 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. As an 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 reshaping 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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Rev P080041-P-Z:
- Full document number: LIGO-P080041-P-Z
- Author(s): Henning Rehbein; Helge Muller-ebhardt; Kentaro Somiya; S.l. Danilishin; Roman Schnabel; K. Danzmann; Yanbei Chen
- Document date: 2008-10-28
- Document received date: 2008-10-28
- Document entry date: 2008-10-28
- Citation reference: PACS numbers: 04.80.Nn, 03.65.Ta, 42.50.Dv, 42.50.Lc, 95.55.Ym

Rev P080041-00-Z:
- Full document number: LIGO-P080041-00-Z
- Author(s): Henning Rehbein; Helge Muller-ebhardt; Kentaro Somiya; Stefan L. Danilishin; R Schnabel; K. Danzmann; Yanbei Chen
- Document date: 2008-04-30
- Document received date: 2008-04-30
- Document entry date: 2008-04-30
Journal References:
Published in Phys Rev D vol. 78 pg. 062003 (11 pgs).

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