Systematic errors and defects in fabricated coronagraph masks and laboratory scale star-shade masks and their performance impact
| Autor: | Daniel W. Wilson, Santos Fregoso, Fang Shi, Jacob Metzman, Camilo Mejia Prada, Karl Yee, Eric Cady, Daniel Ryan, Richard E. Muller, Pierre Echternach, Kunjithapatham Balasubramanian, Robert Casey Wilson, A. J. Eldorado Riggs, Victor White, Byoung-Joon Seo |
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| Rok vydání: | 2017 |
| Předmět: |
Wavefront
Fabrication business.industry Computer science media_common.quotation_subject High contrast imaging Image plane Star (graph theory) 01 natural sciences Exoplanet law.invention 010309 optics Optics law 0103 physical sciences Contrast (vision) business 010303 astronomy & astrophysics Coronagraph media_common |
| Zdroj: | Techniques and Instrumentation for Detection of Exoplanets VIII. |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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