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

Dooley, Katherine ORCID: https://orcid.org/0000-0002-1636-0233, Barsotti, Lisa, Adhikari, Rana X., Evans, Matthew, Fricke, Tobin T., Fritschel, Peter, Frolov, Valera, 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. 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 ≤ 1×10−7 rad rms, and limited impact on in-band strain sensitivity.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	Optical Society of America
ISSN:	1084-7529
Last Modified:	23 Oct 2022 12:49
URI:	https://orca.cardiff.ac.uk/id/eprint/108794

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