Target-in-the-loop adaptive optics: wavefront control in strong speckle-modulation conditions

Details Target-in-the-loop adaptive optics: wavefront control in strong speckle-modulation conditions Target-in-the-loop adaptive optics: wavefront control in strong speckle-modulation conditions

Sep 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002spie.4825...67v&link_type=abstract

High-Resolution Wavefront Control: Methods, Devices, and Applications IV. Edited by Gonglewski, John D.; Vorontsov, Mikhail A.;

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A 37-control-channel adaptive optics target-in-the loop system with phase correction of the outgoing wave capable of operating in the presence of speckle-field-induced strong intensity modulation is presented. System operation is based on speckle field metric optimization using the stochastic parallel gradient descent technique. A quadratic map that linearizes phase modulation response of deformable micromachined mirror to control variable perturbation is investigated. Results demonstrate that adaptive wavefront correction using speckle-field-based beam quality metrics can significantly improve laser beam concentration on extended objects. The use of the quadratic map improves both system convergence rate and magnitude of laser beam concentration on the target.

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