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Proceedings Paper

Progress on broadband control and deformable mirror tolerances in a 2-DM system
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Paper Abstract

Detection and Characterization of extrasolar terrestrial planets using coronagraphic techniques requires wavefront control algorithms to relax tolerances in a space-based observatory. To minimize the time spent correcting aberrations, the algorithms must function in broadband light. Two deformable mirrors in series can correct for both amplitude and phase aberrations. By taking a linear approximation of the propagation between the deformable mirrors we show an approach for broadband correction given a monochromatic estimate. We present progress in monochromatic light, initial experiments for broadband wavefront correction. We also address the additional challenges for a broadband controller such as limitations due to aberrations from spatial frequency folding that exhibit a wavelength squared dependence, which requires a third deformable mirror to correct in broadband. From these results we also discuss controllability of spatial frequencies and show its consequences for both monochromatic and broadband correction when using two deformable mirrors in series.

Paper Details

Date Published: 10 August 2010
PDF: 10 pages
Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 77314S (10 August 2010); doi: 10.1117/12.857336
Show Author Affiliations
Tyler D. Groff, Princeton Univ. (United States)
Alexis Carlotti, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)

Published in SPIE Proceedings Vol. 7731:
Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave
Jacobus M. Oschmann Jr.; Mark C. Clampin; Howard A. MacEwen, Editor(s)

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