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Proceedings Paper

Integrated multi-dithering controller for adaptive optics
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Paper Abstract

Effective compensation of phase noise in laser communication calls for fast, real-time, adaptive wavefront control. We present an analog, continuous-time, high-speed VLSI (Very Large Scale Integration) controller implementing multi-dithering perturbative gradient descent optimization of a direct measure of optical performance. The system applies parallel sinusoidal perturbations to the wavefront over a range of frequencies, and performs parallel synchronous detection of the metric signal to derive the gradient components over each frequency band. The system operates over a wide range of frequencies, supporting applications of model-free adaptive optics extending from compensation of slow atmospheric turbulence to compensation of fast random phase fluctuations in the actuators and laser amplifiers. The system has been tested as a phase controller for a multiple laser beam wavefront propagating through a highly turbulent medium. The results indicate a compensation bandwidth exceeding 300 kHz matching the turbulence bandwidth.

Paper Details

Date Published: 25 September 2007
PDF: 10 pages
Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 67080B (25 September 2007); doi: 10.1117/12.736263
Show Author Affiliations
Dimitrios N. Loizos, Johns Hopkins Univ. (United States)
Ling Liu, Univ. of Maryland, College Park (United States)
Paul P. Sotiriadis, Johns Hopkins Univ. (United States)
Gert Cauwenberghs, Univ. of California, San Diego (United States)
Mikhail A. Vorontsov, Univ. of Maryland, College Park (United States)
Army Research Lab. (United States)

Published in SPIE Proceedings Vol. 6708:
Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation
Stephen M. Hammel; Alexander M. J. van Eijk; Michael T. Valley; Mikhail A. Vorontsov, Editor(s)

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