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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry M. Van Driel
  • Vol. 24, Iss. 6 — Jun. 1, 2007
  • pp: 1336–1343

Thermal tuning of optical cavities for parametric instability control

Jérôme Degallaix, Chunnong Zhao, Li Ju, and David Blair  »View Author Affiliations

JOSA B, Vol. 24, Issue 6, pp. 1336-1343 (2007)

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Thermal tuning of optical Fabry–Perot cavities has been proposed to reduce the parametric gain of high-frequency parametric instabilities in gravitational wave detectors. We investigate the performance achievable for such tuning obtained by thermal actuation of the mirrors (also called test masses) of the arm cavities. We show that for test mass dimensions used in advanced detectors, when circularly symmetric heating is applied to the rear side of the mirror, the steady-state tuning performance is almost independent of the heating pattern and depends only on the heating power. We derived the optimal time-dependent heating required to achieve the fastest possible actuation in sapphire and fused-silica substrates. Our simulations show that sapphire mechanical deformation response to heating is 15 times faster than that of fused silica, although sapphire requires three times more heating power to obtain the same radius of curvature change.

© 2007 Optical Society of America

OCIS Codes
(120.6810) Instrumentation, measurement, and metrology : Thermal effects
(160.4670) Materials : Optical materials

ToC Category:
Optical Devices

Original Manuscript: September 22, 2006
Revised Manuscript: February 2, 2007
Manuscript Accepted: February 19, 2007
Published: May 17, 2007

Jérôme Degallaix, Chunnong Zhao, Li Ju, and David Blair, "Thermal tuning of optical cavities for parametric instability control," J. Opt. Soc. Am. B 24, 1336-1343 (2007)

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