Numerically designed phase-mask for stellar coronagraph

Naoshi Baba; Naoshi Murakami; Noriaki Miura; Motohide Tamura

doi:10.1117/12.2186498

11 September 2015 Numerically designed phase-mask for stellar coronagraph

Naoshi Baba, Naoshi Murakami, Noriaki Miura, Motohide Tamura

Proceedings Volume 9605, Techniques and Instrumentation for Detection of Exoplanets VII; 96051V (2015) https://doi.org/10.1117/12.2186498
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

Phase-mask coronagraph holds the ability to detect exoplanets very close to their parent star. We report a new kind of phase mask that performs the contrast ratio of more than the tenth power of 10 for a circular aperture with shades of a secondary mirror and spiders. The phase distribution of the phase mask is numerically obtained by making the leaked light distribute outside the transparent part of the pupil. We applied the hybrid input-output algorithm, one of phase retrieval methods, to find the phase distribution of the phase mask. We show the characteristics of thus obtained phase mask.

Citation Download Citation

Naoshi Baba, Naoshi Murakami, Noriaki Miura, and Motohide Tamura "Numerically designed phase-mask for stellar coronagraph", Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96051V (11 September 2015); https://doi.org/10.1117/12.2186498

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