18 October 2004 Wavefront tip-tilt/focus-defocus control using a deformable piezoceramic mirror
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We present the results from studying different methods to control a deformable piezoceramic mirror with three degrees of freedom in the context of an optical transceiver system. In the first part, we compare the results of controlling the mirror with the Proportional Integral Differential Algorithm (PID) and the stochastic parallel gradient descent optimization technique (SPGD); results demonstrate that both techniques achieve similar performance. In the second part we built an optical transceiver system using deformable piezoceramic mirrors as active elements. The transceiver system was tested over a free space propagation path and controlled using different variants of the SPGD method. We show that the use of the SPGD algorithm as control method for the piezoceramic mirror adaptively corrects part of the turbulence-induced random wave front phase distortions.
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Carlos J. Hernandez, Gary Carhart, "Wavefront tip-tilt/focus-defocus control using a deformable piezoceramic mirror", Proc. SPIE 5552, Target-in-the-Loop: Atmospheric Tracking, Imaging, and Compensation, (18 October 2004); doi: 10.1117/12.562391; https://doi.org/10.1117/12.562391

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