Adaptive compensation of the effects of nonstationary thermal blooming based on the stochastic parallel gradient descent optimization method

Details Adaptive compensation of the effects of nonstationary thermal blooming based on the stochastic parallel gradient descent optimization method Adaptive compensation of the effects of nonstationary thermal blooming based on the stochastic parallel gradient descent optimization method

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5162...28c&link_type=abstract

Advanced Wavefront Control: Methods, Devices, and Applications. Edited by Gonglewski, John D.; Vorontsov, Mikhail A.; Gruneisen

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A 40-control-channel adaptive optics system capable of minimizing the impact of propagation medium induced thermal blooming effect in the target-in-the-loop optical setting is presented. The optical system uses two adaptive mirrors: a 37-channel deformable mirror manufactured by Xinetics Inc. and a 3-channel tip-tilt/defocus adaptive mirror constructed at the Army Research Laboratory. System operation is based on phase control of the outgoing wavefront based on the stochastic parallel gradient descent optimization technique. The optimized metric depends solely on characteristics of the returned speckle field scattered by an extended target surface registered at the transmitter plane. Results demonstrate that adaptive wavefront correction using a speckle-field-based beam quality metric can improve laser beam concentration on extended objects in the presence of propagation medium thermal blooming effects.

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