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Proceedings Paper

Adaptive optics: dither optimization method in an adaptive optic modal control
Author(s): Philippe Hirel; Jean-Luc Lamard
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Paper Abstract

In order to correct, with a wide bandwidth, wavefront distorsions due to various origins, such as thermic deformations of mirrors or atmospheric turbulences, we use a dither mirror, a correction mirror and powerful computers controlling a complete electronics system (detection, dithering and control). Wavefront compensation is achieved by a modal dithering and a modal control. Therefore we can control the main optical modes present in atmospheric turbulences and improve their compensation. Concerning to modal dithering, we send to each actuator of the dither mirror a linear combination of the dither frequencies which is a beating produced by a digital synthetizer which has a limited dynamic. Therefore the dither beating set must be normalized, which may reduce the control performances. So we propose a method to optimize the dynamic of the beatings by adjusting the phase of individual dither frequencies at the output of the synthetizers.

Paper Details

Date Published: 1 August 1990
PDF: 11 pages
Proc. SPIE 1271, Adaptive Optics and Optical Structures, (1 August 1990); doi: 10.1117/12.20392
Show Author Affiliations
Philippe Hirel, Laserdot (France)
Jean-Luc Lamard, Ecole Nationale Superieure d'Ingenieurs de Caen (France)

Published in SPIE Proceedings Vol. 1271:
Adaptive Optics and Optical Structures
Joachim J. Schulte-in-den-Baeumen; Robert K. Tyson, Editor(s)

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