Angular control of optical cavities in a radiation-pressure-dominated regime: the Enhanced LIGO case
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Evans_Angular control.pdf
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Author(s)
Dooley, K. L.
Barsotti, Lisa
Adhikari, Rana X.
Fricke, T. T.
Frolov, V. V.
Kawabe, Keita
Evans, Matthew J
Fritschel, Peter K
Smith, Nicolas de Mateo
Date Issued
November 2013
Journal
Journal of the Optical Society of America A
Publisher
Optical Society of America
Citation
Dooley, Katherine L., Lisa Barsotti, Rana X. Adhikari, Matthew Evans, Tobin T. Fricke, Peter Fritschel, Valera Frolov, Keita Kawabe, and Nicolas Smith-Lefebvre. “Angular Control of Optical Cavities in a Radiation-Pressure-Dominated Regime: The Enhanced LIGO Case.” Journal of the Optical Society of America A 30, no. 12 (December 1, 2013): 2618.
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Author's final manuscript
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 × 10[superscript −7] rad rms, and limited impact on in-band strain sensitivity.
MIT Department
Massachusetts Institute of Technology. Department of Physics
MIT Kavli Institute for Astrophysics and Space Research
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DOI of Published Version
http://dx.doi.org/10.1364/josaa.30.002618
