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Proceedings Paper

Phase-retrieval-based wavefront metrology for high-contrast coronography: 2. Reconstructions through a shaped pupil apodizer
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Paper Abstract

We discuss the use of parametric phase-diverse phase retrieval to characterize and optimize the transmitted wavefront of a high-contrast apodized pupil coronagraph with and without an apodizer. We apply our method to correct the transmitted wavefront of the HiCAT (High contrast imager for Complex Aperture Telescopes) coronagraphic testbed. This correction requires a series of calibration steps, which we describe. The correction improves the system wavefront from 16 nm RMS to 3.0 nm RMS for the case where a uniform circular aperture is in place. We further measure the wavefront with the apodizer in place to be 11.7 nm RMS. Improvement to the apodized pupil phase retrieval process is necessary before a correction based on this measurement can be applied.

Paper Details

Date Published: 9 September 2019
PDF: 17 pages
Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 1111712 (9 September 2019);
Show Author Affiliations
Gregory R. Brady, Space Telescope Science Institute (United States)
Peter Petrone III, Space Telescope Science Institute (United States)
Iva Laginja, Space Telescope Science Institute (United States)
Keira Brooks, Space Telescope Science Institute (United States)
Manxuan (Rebecca) Zhang, Space Telescope Science Institute (United States)
Caltech (United States)
Mamadou N'Diaye, Observatoire de la Côte d'Azur (France)
Christopher Moriarty, Harvard-Smithsonian Ctr. for Astrophysics (United States)
John Hagopian, Advanced NanoPhotonics, Inc. (United States)
Rémi Soummer, Space Telescope Science Institute (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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