Phase-retrieval-based wavefront metrology for high contrast coronagraphy

Gregory R. Brady; Christopher Moriarty; Peter Petrone; Iva Laginja; Keira Brooks; Tom Comeau; Lucie Leboulleux; Rémi Soummer

doi:10.1117/12.2314368

24 July 2018 Phase-retrieval-based wavefront metrology for high contrast coronagraphy

Gregory R. Brady, Christopher Moriarty, Peter Petrone, Iva Laginja, Keira Brooks, Tom Comeau, Lucie Leboulleux, Rémi Soummer

Author Affiliations +

Proceedings Volume 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave; 106986I (2018) https://doi.org/10.1117/12.2314368
Event: SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States

Abstract

We discuss the use of parametric phase-diverse phase retrieval as an in-situ high-fidelity wavefront measurement method to characterize and optimize the transmitted wavefront of a high-contrast coronagraphic instrument. 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.

Citation Download Citation

Gregory R. Brady, Christopher Moriarty, Peter Petrone, Iva Laginja, Keira Brooks, Tom Comeau, Lucie Leboulleux, and Rémi Soummer "Phase-retrieval-based wavefront metrology for high contrast coronagraphy", Proc. SPIE 10698, Space Telescopes and Instrumentation 2018: Optical, Infrared, and Millimeter Wave, 106986I (24 July 2018); https://doi.org/10.1117/12.2314368

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