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Proceedings Paper

Optimized focal and pupil plane masks for vortex coronagraphs on telescopes with obstructed apertures
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Paper Abstract

We present methods for optimizing pupil and focal plane optical elements that improve the performance of vortex coronagraphs on telescopes with obstructed or segmented apertures. Phase-only and complex masks are designed for the entrance pupil, focal plane, and the plane of the Lyot stop. Optimal masks are obtained using both analytical and numerical methods. The latter makes use of an iterative error reduction algorithm to calculate "correcting" optics that mitigate unwanted diffraction from aperture obstructions. We analyze the achieved performance in terms of starlight suppression, contrast, off-axis image quality, and chromatic dependence. Manufacturing considerations and sensitivity to aberrations are also discussed. This work provides a path to joint optimization of multiple coronagraph planes to maximize sensitivity to exoplanets and other faint companions.

Paper Details

Date Published: 11 September 2015
PDF: 19 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96051I (11 September 2015); doi: 10.1117/12.2187236
Show Author Affiliations
Garreth J. Ruane, Rochester Institute of Technology (United States)
Univ. de Liège (Belgium)
Olivier Absil, Univ. de Liège (Belgium)
Elsa Huby, Univ. de Liège (Belgium)
Dimitri Mawet, California Institute of Technology (United States)
Christian Delacroix, Ctr. de Recherche Astrophysique de Lyon (France)
Brunella Carlomagno, Univ. de Liège (Belgium)
Pierre Piron, Univ. de Liège (Belgium)
Grover A. Swartzlander, Rochester Institute of Technology (United States)


Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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