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Journal of the Optical Society of America A

Journal of the Optical Society of America A

| OPTICS, IMAGE SCIENCE, AND VISION

  • Editor: Franco Gori
  • Vol. 30, Iss. 12 — Dec. 1, 2013
  • pp: 2618–2626

Angular control of optical cavities in a radiation-pressure-dominated regime: the Enhanced LIGO case

Katherine L. Dooley, Lisa Barsotti, Rana X. Adhikari, Matthew Evans, Tobin T. Fricke, Peter Fritschel, Valera Frolov, Keita Kawabe, and Nicolás Smith-Lefebvre  »View Author Affiliations


JOSA A, Vol. 30, Issue 12, pp. 2618-2626 (2013)
http://dx.doi.org/10.1364/JOSAA.30.002618


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Abstract

We describe the angular sensing and control (ASC) of 4 km detectors of the Laser Interferometer Gravitational-Wave Observatory (LIGO). Enhanced LIGO, the culmination of the first generation LIGO detectors, operated between 2009 and 2010 with about 40 kW of laser power in the arm cavities. In this regime, radiation-pressure effects are significant and induce instabilities in the angular opto-mechanical transfer functions. Here we present and motivate the ASC design in this extreme case and present the results of its implementation in Enhanced LIGO. Highlights of the ASC performance are successful control of opto-mechanical torsional modes, relative mirror motions of 1×107rad rms, and limited impact on in-band strain sensitivity.

© 2013 Optical Society of America

OCIS Codes
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(350.1270) Other areas of optics : Astronomy and astrophysics
(140.3518) Lasers and laser optics : Lasers, frequency modulated

ToC Category:
Instrumentation, Measurement, and Metrology

History
Original Manuscript: September 19, 2013
Manuscript Accepted: October 8, 2013
Published: November 27, 2013

Citation
Katherine L. Dooley, Lisa Barsotti, Rana X. Adhikari, Matthew Evans, Tobin T. Fricke, Peter Fritschel, Valera Frolov, Keita Kawabe, and Nicolás Smith-Lefebvre, "Angular control of optical cavities in a radiation-pressure-dominated regime: the Enhanced LIGO case," J. Opt. Soc. Am. A 30, 2618-2626 (2013)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-30-12-2618


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