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Type: Journal article
Title: Feedback control of thermal lensing in a high optical power cavity
Author: Fan, Y.
Zhao, C.
Degallaix, J.
Ju, L.
Blair, D.
Slagmolen, B.
Hosken, D.
Brooks, A.
Veitch, P.
Munch, J.
Citation: Review of Scientific Instruments, 2008; 79(10):104501-1-104501-5
Publisher: Amer Inst Physics
Issue Date: 2008
ISSN: 0034-6748
Statement of
Y. Fan, C. Zhao, J. Degallaix, L. Ju, D. G. Blair, B. J. J. Slagmolen, D. J. Hosken, A. F. Brooks, P. J. Veitch and J. Munch
Abstract: This paper reports automatic compensation of strong thermal lensing in a suspended 80 m optical cavity with sapphire test mass mirrors. Variation of the transmitted beam spot size is used to obtain an error signal to control the heating power applied to the cylindrical surface of an intracavity compensation plate. The negative thermal lens created in the compensation plate compensates the positive thermal lens in the sapphire test mass, which was caused by the absorption of the high intracavity optical power. The results show that feedback control is feasible to compensate the strong thermal lensing expected to occur in advanced laser interferometric gravitational wave detectors. Compensation allows the cavity resonance to be maintained at the fundamental mode, but the long thermal time constant for thermal lensing control in fused silica could cause difficulties with the control of parametric instabilities.
Keywords: feedback; gravitational wave detectors; laser cavity resonators; laser mirrors; light interferometry; measurement by laser beam; optical control; sapphire; thermal lensing; thermo-optical devices
Rights: © 2008 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.
RMID: 0020083701
DOI: 10.1063/1.2982239
Appears in Collections:Physics publications
Environment Institute publications

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