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Residual amplitude modulation in interferometric gravitational wave detectors

Kokeyama, Keiko, Izumi, Kiwamu, Korth, William Z., Smith-Lefebvre, Nicolas, Arai, Koji and Adhikari, Rana X. 2014. Residual amplitude modulation in interferometric gravitational wave detectors. Journal of the Optical Society of America A 31 (1) , pp. 81-88. 10.1364/JOSAA.31.000081

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The effects of residual amplitude modulation (RAM) in laser interferometers using heterodyne sensing can be substantial and difficult to mitigate. In this work, we analyze the effects of RAM on a complex laser interferometer used for gravitational wave detection. The RAM introduces unwanted offsets in the cavity length signals and thereby shifts the operating point of the optical cavities from the nominal point via feedback control. This shift causes variations in the sensing matrix, and leads to degradation in the performance of the precision noise subtraction scheme of the multiple-degree-of-freedom control system. In addition, such detuned optical cavities produce an optomechanical spring, which also perturbs the sensing matrix. We use our simulations to derive requirements on RAM for the Advanced LIGO (aLIGO) detectors, and show that the RAM expected in aLIGO will not limit its sensitivity.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Optical Society of America
ISSN: 1084-7529
Date of First Compliant Deposit: 19 March 2021
Date of Acceptance: 10 November 2013
Last Modified: 15 Apr 2021 14:45

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