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Journal of Astronomical Telescopes, Instruments, and Systems

WFIRST-AFTA coronagraph shaped pupil masks: design, fabrication, and characterization
Author(s): Kunjithapatham Balasubramanian; Victor E. White; Karl Y. Yee; Pierre M. Echternach; Richard E. Muller; Matthew R. Dickie; Eric J. Cady; Camilo Mejia Prada; Daniel J. Ryan; Ilya Poberezhskiy; Brian D. Kern; Hanying Zhou; John E. Krist; Bijan Nemati; A. J. Eldorado Riggs; Neil T. Zimmerman; N. Jeremy Kasdin
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Paper 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.

Paper Details

Date Published: 7 December 2015
PDF: 16 pages
J. Ast. Inst. Sys. 2(1) 011005 doi: 10.1117/1.JATIS.2.1.011005
Published in: Journal of Astronomical Telescopes, Instruments, and Systems Volume 2, Issue 1
Show Author Affiliations
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Victor E. White, Jet Propulsion Lab. (United States)
Karl Y. Yee, Jet Propulsion Lab. (United States)
Pierre M. Echternach, Jet Propulsion Lab. (United States)
Richard E. Muller, Jet Propulsion Lab. (United States)
Matthew R. Dickie, Jet Propulsion Lab. (United States)
Eric J. Cady, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
Daniel J. Ryan, Jet Propulsion Lab. (United States)
Ilya Poberezhskiy, Jet Propulsion Lab. (United States)
Brian D. Kern, Jet Propulsion Lab. (United States)
Hanying Zhou, Jet Propulsion Lab. (United States)
John E. Krist, Jet Propulsion Lab. (United States)
Bijan Nemati, Jet Propulsion Lab. (United States)
A. J. Eldorado Riggs, Princeton Univ. (United States)
Neil T. Zimmerman, Princeton Univ. (United States)
N. Jeremy Kasdin, Princeton Univ. (United States)


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