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

Dooley, Katherine L. and Barsotti, Lisa and Adhikari, Rana X. and Evans, Matthew and Fricke, Tobin T. and Fritschel, Peter and Frolov, Valera and Kawabe, Keita and Smith-Lefebvre, Nicolás (2013) Angular control of optical cavities in a radiation-pressure-dominated regime: the Enhanced LIGO case. Journal of the Optical Society of America A, 30 (12). pp. 2618-2626. ISSN 1084-7529. doi:10.1364/JOSAA.30.002618.

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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^−7  rad rms, and limited impact on in-band strain sensitivity.

Item Type:Article
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Adhikari, Rana X.0000-0002-5731-5076
Additional Information:© 2013 Optical Society of America. Received September 19, 2013; accepted October 8, 2013; posted October 31, 2013 (Doc. ID 197891); published November 27, 2013. We would like to thank D. H. Reitze, D. Sigg, Y. Aso, G. Mueller, and H. Grote for fruitful discussions. LIGO was constructed by the California Institute of Technology and Massachusetts Institute of Technology with funding from the United States National Science Foundation under grant PHY-0757058. K. L. Dooley recieved support from the National Science Foundation under grant PHY-0855313. This paper has LIGO document number P1100089.
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LIGO DocumentP1100089
Issue or Number:12
Classification Code:OCIS codes: (120.2230) Fabry-Perot; (120.3180) Interferometry; (140.3518) Lasers, frequency modulated; (350.1270) Astronomy and astrophysics
Record Number:CaltechAUTHORS:20140117-113305704
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Official 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)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:43432
Deposited On:22 Jan 2014 17:44
Last Modified:10 Nov 2021 16:37

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