Double optical spring enhancement for gravitational-wave detectors

Henning Rehbein, Helge Müller-Ebhardt, Kentaro Somiya, Stefan L. Danilishin, Roman Schnabel, Karsten Danzmann, and Yanbei Chen
Phys. Rev. D 78, 062003 – Published 16 September 2008

Abstract

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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  • Received 20 May 2008

DOI:https://doi.org/10.1103/PhysRevD.78.062003

©2008 American Physical Society

Authors & Affiliations

Henning Rehbein1, Helge Müller-Ebhardt1, Kentaro Somiya2,3, Stefan L. Danilishin1,4, Roman Schnabel1, Karsten Danzmann1, and Yanbei Chen2,3

  • 1Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Institut für Gravitationsphysik, Leibniz Universität Hannover, Callinstrasse 38, 30167 Hannover, Germany
  • 2California Institute of Techology, Theoretical Astrophysics 130-33, Pasadena, California 91125, USA
  • 3Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Am Mühlenberg 1, 14476 Potsdam, Germany
  • 4Department of Physics, Moscow State University, Moscow 119992, Russia

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Issue

Vol. 78, Iss. 6 — 15 September 2008

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