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Proceedings Paper

Optimizing the regularization in broadband wavefront control algorithm for WFIRST coronagraph
Author(s): Erkin Sidick; Byoung-Joon Seo; Brian Kern; David Marx; Ilya Poberezhskiy; Bijan Nemati
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Paper Abstract

The WFIRST/AFTA 2.4 m space telescope currently under study includes a stellar coronagraph for the imaging and the spectral characterization of extrasolar planets. The coronagraph employs sequential deformable mirrors to compensate for phase and amplitude errors. Using the optical model of an Occulting Mask Coronagraph (OMC) testbed at the Jet Propulsion Laboratory (JPL), we have investigated and compared through modeling and simulations the performance of several actuator regularization-schemes in broadband wavefront control algorithm used to generate dark holes in an OMC, such as a Hybrid Lyot Coronagraph (HLC). Using the concept of a Tikhonov filter constituting the G-matrix, we have explained what the different regularization schemes do to singular-modes during a wavefront control (WFC) process called Electric Field Conjugation (EFC). In some cases we confirmed the numerical predictions with the testbed measured results. We present our findings in this paper.

Paper Details

Date Published: 1 September 2017
PDF: 13 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 1040022 (1 September 2017); doi: 10.1117/12.2274440
Show Author Affiliations
Erkin Sidick, Jet Propulsion Lab. (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
Brian Kern, Jet Propulsion Lab. (United States)
David Marx, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Bijan Nemati, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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