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Proceedings Paper

Modified deformable mirror stroke minimization control for direct imaging of exoplanets
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Paper Abstract

For direct imaging of faint exoplanets, coronagraphs are widely used to suppress light and achieve a high contrast. Wavefront correction algorithms based on adaptive optics are introduced simultaneously to mitigate aberrations in the optical system. Stroke minimization is one of the primary control algorithms used for high-contrast wavefront control. This technique calculates the minimum deformation across the deformable mirrors' surface under the constraint that a targeted average contrast level in the search areas, namely the dark holes, is achieved. In this paper we present a modified linear constraint stroke minimization algorithm. Instead of using a single constraint on intensity averaged over all pixels, we constrain the electric field's real and imaginary part of each pixel in the dark holes. The new control algorithm can be written into a linear programming problem. Model reduction methods, including pixel binning and singular value decomposition (SVD), are further employed to avoid over-constraining the problem and to speed up computation. In numerical simulation, we find that the revised algorithm leads to more uniform dark holes and faster convergence.

Paper Details

Date Published: 8 August 2016
PDF: 12 pages
Proc. SPIE 9913, Software and Cyberinfrastructure for Astronomy IV, 991337 (8 August 2016); doi: 10.1117/12.2232030
Show Author Affiliations
He Sun, Princeton Univ. (United States)
A. J. Eldorado Riggs, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)
Robert Vanderbei, Princeton Univ. (United States)
Tyler Groff, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 9913:
Software and Cyberinfrastructure for Astronomy IV
Gianluca Chiozzi; Juan C. Guzman, Editor(s)

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