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Proceedings Paper

Closed-loop control techniques for an adaptive-optical system with an interferometric wavefront sensor
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Paper Abstract

The self-referencing interferometer (SRI) wavefront sensor (WFS) is being developed for applications requiring laser propagation in strong scintillation. Because it directly measures the optical field of the wavefront, the SRI WFS is less effected by scintillation than conventional WFSs. This feature also means the phase determined from the WFS measurements is limited to the range -π to π, due to the use of the arctangent function. If a segmented wavefront corrector is used, this constraint is not a problem. However, if a continuous facesheet deformable mirror is used, the resulting phase should be unwrapped in order to minimize fitting error. There are a couple of places in the adaptiveoptical (AO) closed-loop control process where an unwrapping algorithm can be inserted. Simulations of these configurations have shown that how and where the unwrapping is carried out affects overall AO performance and loop stability. This paper presents an overview of the unwrapping options and the associated issues. A laboratory demonstration of two control loop configurations was carried out to test the validity of the simulation results. These experiments and their outcome are discussed.

Paper Details

Date Published: 25 September 2006
PDF: 8 pages
Proc. SPIE 6306, Advanced Wavefront Control: Methods, Devices, and Applications IV, 63060F (25 September 2006); doi: 10.1117/12.682481
Show Author Affiliations
Laura M. Klein, Air Force Research Lab. (United States)
Troy A. Rhoadarmer, Air Force Research Lab. (United States)

Published in SPIE Proceedings Vol. 6306:
Advanced Wavefront Control: Methods, Devices, and Applications IV
Michael K. Giles; John D. Gonglewski; Richard A. Carreras, Editor(s)

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