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Proceedings Paper

Design and performance analysis of a PIAACMC coronagraph on a segmented aperture
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Paper Abstract

To directly image and characterize exoplanets, starlight suppression systems rely on coronagraphs to optically remove starlight while preserving planet light for spectroscopy. The Phase-Induced Amplitude Apodization Complex Mask Coronagraph (PIAACMC) is an attractive coronagraph option for the next generation of large space telescopes optimized for habitable exoplanet imaging: PIAACMC offers high throughput, small inner working angle (IWA) with little loss in image quality. PIAACMC is also compatible with segmented apertures, preserving much of the throughput and resolution of a full pupil. Coronagraph compatibility with segmented apertures is essential for the success of habitable planet characterization with future large apertures, such as the Large UV / Optical/ Infrared (LUVOIR) concept currently under way to inform the 2020 decadal survey. We present a design of PIAACMC for a segmented aperture, using the segmented aperture currently considered for LUVOIR as a representative case. This design is optimized to be resilient to tip/tilt jitter and large stellar angular sizes. This also enables it to have improved tolerance to polarization-specific aberrations, which are dominated by low-order modes such as tip-tilt and astigmatism. We simulate and study the performance of this design using a simplified instrument model. These simulations include wavefront control and tip-tilt errors. We characterize the performance of our design in monochromatic as well as broadband light in terms of throughput, inner working angle, contrast, area of the dark zone, and sensitivity to low-order aberrations.

Paper Details

Date Published: 1 August 2018
PDF: 10 pages
Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106981H (1 August 2018); doi: 10.1117/12.2314202
Show Author Affiliations
Ruslan Belikov, NASA Ames Research Ctr. (United States)
Stephen Bryson, NASA Ames Research Ctr. (United States)
Dan Sirbu, NASA Ames Research Ctr. (United States)
Olivier Guyon, The Univ. of Arizona (United States)
Eduardo Bendek, NASA Ames Research Ctr. (United States)
Brian Kern, NASA Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 10698:
Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave
Makenzie Lystrup; Howard A. MacEwen; Giovanni G. Fazio; Natalie Batalha; Nicholas Siegler; Edward C. Tong, Editor(s)

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