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Proceedings Paper

Sparse wavefront control: A new approach to high-contrast imaging
Author(s): Eduardo Bendek; Dan Sirbu; Christopher Henze; Ruslan Belikov; Thomas Milster; Emily Finan; Eugene Pluzhnik
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Paper Abstract

Current high-contrast imaging systems implement wavefront control using traditional deformable mirrors developed for atmospheric turbulence correction, which require large strokes, high-speed, and continuous phase correction. However, high-contrast imaging has different requirements. Thus, developing a specialized deformable mirror for this application able to meet the demanding requirements of future exoplanet imaging flagship missions is valuable for the exoplanet scientific community. In this paper, we propose a novel wavefront control approach, called Sparse Wave-Front Control (SWFC), which enables high-contrast imaging using sparse phase changes on the active surface re-directing coherent starlight to null speckles. To validate SWFC, we simulated a telescope equipped with a Phase Induced Amplitude Apodization (PIAA) coronagraph and a 100 by 100 actuator sparse Deformable Mirror to null speckles caused by the optical system aberrations. We modeled the mirror as a flat surface where narrow gaussian influence functions represent actuators. We performed wavefront control utilizing Electric Field Conjugation achieving 6.7e-11 mean contrast between 3 to 35λ/D in monochromatic light and 7.4e-11 in 10% broadband light. In the second part of this paper, we propose an approach to manufacture Sparse Deformable Mirrors utilizing photosensitive polymers, which could be placed below the mirror coating and can be photonically actuated by back illumination through the mirror substrate.

Paper Details

Date Published: 6 July 2018
PDF: 9 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981M (6 July 2018); doi: 10.1117/12.2313963
Show Author Affiliations
Eduardo Bendek, NASA Ames Research Ctr. (United States)
Bay Area Environmental Research Institute (United States)
Dan Sirbu, NASA Ames Research Ctr. (United States)
Bay Area Environmental Research Institute (United States)
Christopher Henze, NASA Ames Research Ctr. (United States)
Ruslan Belikov, NASA Ames Research Ctr. (United States)
Thomas Milster, College of Optical Sciences, Univ. of Arizona (United States)
Emily Finan, College of Optical Sciences, Univ. of Arizona (United States)
Eugene Pluzhnik, NASA Ames Research Ctr. (United States)
Bay Area Environmental Research Institute (United States)


Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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