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Proceedings Paper

Fabrication of coronagraph masks and laboratory scale star-shade masks: characteristics, defects, and performance
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Paper Abstract

NASA WFIRST mission has planned to include a coronagraph instrument to find and characterize exoplanets. Masks are needed to suppress the host star light to better than 10-8 – 10-9 level contrast over a broad bandwidth to enable the coronagraph mission objectives. Such masks for high contrast coronagraphic imaging require various fabrication technologies to meet a wide range of specifications, including precise shapes, micron scale island features, ultra-low reflectivity regions, uniformity, wave front quality, etc. We present the technologies employed at JPL to produce these pupil plane and image plane coronagraph masks, and lab-scale external occulter masks, highlighting accomplishments from the high contrast imaging testbed (HCIT) at JPL and from the high contrast imaging lab (HCIL) at Princeton University. Inherent systematic and random errors in fabrication and their impact on coronagraph performance are discussed with model predictions and measurements.

Paper Details

Date Published: 12 September 2017
PDF: 16 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 104000C (12 September 2017); doi: 10.1117/12.2274059
Show Author Affiliations
Kunjithapatham Balasubramanian, Jet Propulsion Lab. (United States)
A. J. Eldorado Riggs, 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)
Daniel Wilson, Jet Propulsion Lab. (United States)
Pierre Echternach, Jet Propulsion Lab. (United States)
Richard Muller, Jet Propulsion Lab. (United States)
Camilo Mejia Prada, Jet Propulsion Lab. (United States)
Byoung-Joon Seo, Jet Propulsion Lab. (United States)
Fang Shi, Jet Propulsion Lab. (United States)
Daniel Ryan, Jet Propulsion Lab. (United States)
Santos Fregoso, Jet Propulsion Lab. (United States)
Jacob Metzman, Jet Propulsion Lab. (United States)
Robert Casey Wilson, 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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