Active correction of thermal lensing through external radiative thermal actuation
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2004
Authors
Lawrence, R.
Ottaway, D.
Zucker, M.
Fritschel, P.
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Optics Letters, 2004; 29(22):2635-2637
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Ryan Lawrence, David Ottaway, Michael Zucker, and Peter Fritschel
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Abstract
Absorption of laser beam power in optical elements induces thermal gradients that may cause unwanted phase aberrations. In precision measurement applications, such as laser interferometric gravitational-wave detection, corrective measures that require mechanical contact with or attachments to the optics are precluded by noise considerations. We describe a radiative thermal corrector that can counteract thermal lensing and (or) thermoelastic deformation induced by coating and substrate absorption of collimated Gaussian beams. This radiative system can correct anticipated distortions to a high accuracy, at the cost of an increase in the average temperature of the optic. A quantitative analysis and parameter optimization is supported by results from a simplified proof-of-principle experiment, demonstrating the method's feasibility for our intended application.
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© 2004 Optical Society of America