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Double optical spring enhancement for gravitational-wave detectors

Rehbein, Henning and Müller-Ebhardt, Helge and Somiya, Kentaro and Danilishin, Stefan L. and Schnabel, Roman and Danzmann, Karsten and Chen, Yanbei (2008) Double optical spring enhancement for gravitational-wave detectors. Physical Review D, 78 (6). Art. No. 062003. ISSN 2470-0010. doi:10.1103/PhysRevD.78.062003.

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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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Schnabel, Roman0000-0003-2896-4218
Chen, Yanbei0000-0002-9730-9463
Additional Information:©2008 The American Physical Society. (Received 20 May 2008; published 16 September 2008) We thank S. Waldman and K. Strain as well as T. Corbitt, N. Mavalvala and C. Wipf for very useful discussions. We thank R. Adhikari for suggesting the level of reduction of classical noise. Research of H.M.-E., K.S. and Y.C. is supported by the Alexander von Humboldt Foundation’s Sofja Kovalevskaja Program. Y.C. is also supported by NSF Grants No. PHY-0653653 and No. PHY-0601459, as well as the David and Barbara Groce startup fund at Caltech. Research of S.L.D. is also supported by the Alexander von Humboldt Foundation. Research of H.R. and R.S. is supported by the Deutsche Forschungsgemeinschaft through the SFB No. 407.
Funding AgencyGrant Number
Alexander von Humboldt FoundationUNSPECIFIED
National Science FoundationPHY-0653653
National Science FoundationPHY-0601459
David and Barbara Groce Startup Fund, CaltechUNSPECIFIED
Deutsche Forschungsgemeinschaft (DFG)SFB 407
Issue or Number:6
Record Number:CaltechAUTHORS:REHprd08
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ID Code:11699
Deposited By: Archive Administrator
Deposited On:20 Sep 2008 01:35
Last Modified:08 Nov 2021 22:01

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