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Proceedings Paper

Critical characteristics of coronagraph masks influencing high contrast performance
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Paper Abstract

High contrast imaging and characterization of faint exoplanets require a coronagraph instrument to efficiently suppress the host star light to 10-9 level contrast over a broad spectral bandwidth. The NASA WFIRST mission plan includes a coronagraph instrument to demonstrate the technology needed to image and characterize exoplanets. Lyot coronagraph masks designed to serve at the focal plane followed by a Lyot stop will be key elements in the WFIRST coronagraph and in future advanced missions such as LUVOIR (Bolcar (2019) and HabEx (Morgan 2019, Martin 2019)). Shaped pupil masks designed to work in reflective geometry are also employed in the WFIRST Coronagraph. High-contrast performance reaching much better than 10-9 contrast requires very tight design, fabrication tolerances, and material properties to meet a wide range of specifications, including precise shapes, micron-scale island features, ultra-low reflectivity regions, uniformity, wavefront quality, etc. In this paper, we present all the critical analytical and measured properties of materials and designs in relation to the results from our coronagraph testbeds.

Paper Details

Date Published: 13 September 2019
PDF: 14 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 111171H (13 September 2019); doi: 10.1117/12.2530825
Show Author Affiliations
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
Keith Patterson, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
A.J. Eldorado Riggs, Jet Propulsion Lab. (United States)
Hanying Zhou, Jet Propulsion Lab. (United States)
Dwight Moody, Jet Propulsion Lab. (United States)
Eric Cady, Jet Propulsion Lab. (United States)
Victor White, Jet Propulsion Lab. (United States)
Karl Yee, Jet Propulsion Lab. (United States)
Richard Muller, Jet Propulsion Lab. (United States)
Pierre Echternach, Jet Propulsion Lab. (United States)
Frank Greer, Jet Propulsion Lab. (United States)
Daniel Wilson, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 11117:
Techniques and Instrumentation for Detection of Exoplanets IX
Stuart B. Shaklan, Editor(s)

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