Special Section on WFIRST-AFTA Coronagraphs

WFIRST-AFTA coronagraph shaped pupil masks: design, fabrication, and characterization

[+] Author Affiliations
Kunjithapatham Balasubramanian, Victor White, Karl Yee, Pierre Echternach, Richard Muller, Matthew Dickie, Eric Cady, Camilo Mejia Prada, Daniel Ryan, Ilya Poberezhskiy, Brian Kern, Hanying Zhou, John Krist, Bijan Nemati

Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109, United States

A. J. Eldorado Riggs, Neil T. Zimmerman, N. Jeremy Kasdin

Princeton University, Department of Mechanical and Aerospace Engineering, Princeton, New Jersey 08544, United States

J. Astron. Telesc. Instrum. Syst. 2(1), 011005 (Dec 07, 2015). doi:10.1117/1.JATIS.2.1.011005
History: Received June 4, 2015; Accepted October 20, 2015
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Abstract.  NASA WFIRST-AFTA mission study includes a coronagraph instrument to find and characterize exoplanets. Various types of masks could be employed to suppress the host starlight to about 109 level contrast over a broad spectrum to enable the coronagraph mission objectives. Such masks for high-contrast internal coronagraphic imaging require various fabrication technologies to meet a wide range of specifications, including precise shapes, micron scale island features, ultralow reflectivity regions, uniformity, wave front quality, and achromaticity. We present the approaches employed at JPL to produce pupil plane and image plane coronagraph masks by combining electron beam, deep reactive ion etching, and black silicon technologies with illustrative examples of each, highlighting milestone accomplishments from the High Contrast Imaging Testbed at JPL and from the High Contrast Imaging Lab at Princeton University.

© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Kunjithapatham Balasubramanian ; Victor White ; Karl Yee ; Pierre Echternach ; Richard Muller, et al.
"WFIRST-AFTA coronagraph shaped pupil masks: design, fabrication, and characterization", J. Astron. Telesc. Instrum. Syst. 2(1), 011005 (Dec 07, 2015). ; http://dx.doi.org/10.1117/1.JATIS.2.1.011005


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