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Type: Journal article
Title: Modeling thermoelastic distortion of optics using elastodynamic reciprocity
Author: King, E.
Levin, Y.
Ottaway, D.
Veitch, P.
Citation: Physical Review D - Particles, Fields, Gravitation, and Cosmology, 2015; 92(2):022005-1-022005-8
Publisher: American Physical Society
Issue Date: 2015
ISSN: 1550-2368
Statement of
Eleanor King, Yuri Levin, David Ottaway, and Peter Veitch
Abstract: Thermoelastic distortion resulting from optical absorption by transmissive and reflective optics can cause unacceptable changes in optical systems that employ high-power beams. In advanced-generation laser-interferometric gravitational wave detectors, for example, optical absorption is expected to result in wavefront distortions that would compromise the sensitivity of the detector, thus necessitating the use of adaptive thermal compensation. Unfortunately, these systems have long thermal time constants, and so predictive feed-forward control systems could be required, but the finite-element analysis is computationally expensive. We describe here the use of the Betti-Maxwell elastodynamic reciprocity theorem to calculate the response of linear elastic bodies (optics) to heating that has arbitrary spatial distribution. We demonstrate, using a simple example, that it can yield accurate results in computational times that are significantly less than those required for finite-element analyses.
Rights: © 2015 American Physical Society
RMID: 0030033396
DOI: 10.1103/PhysRevD.92.022005
Appears in Collections:IPAS publications

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