Improvement of coronagraphy using optimal apodizations

Remi Soummer; Claude Aime; Andre Ferrari; P. E. Falloon

doi:10.1117/12.457640

3 March 2003 Improvement of coronagraphy using optimal apodizations

Remi Soummer, Claude Aime, Andre Ferrari, P. E. Falloon

Proceedings Volume 4860, High-Contrast Imaging for Exo-Planet Detection; (2003) https://doi.org/10.1117/12.457640
Event: Astronomical Telescopes and Instrumentation, 2002, Waikoloa, Hawai'i, United States

Abstract

This communication deals with apodization and coronagraphy. For apodization alone, we present analytical studies of point spread functions obtained with a rectangular or a circular telescope apodized by cross-linear or circular prolate spheroidal functions, respectively. Results are compared with sonine apodizations investigated by Nisenson and Papaliolios (2001) for the Apodized Square Aperture project. For coronagraphy, prolate functions are the optimal apodizers for rectangular and circular apertures. With the Roddier & Roddier phase mask technique, these apodizations can produce a total extinction of the star light. For Lyot coronagraphy, the extinction, not complete, is surprisingly good for a reasonable mask size. A comparison between coronagraphy and apodization alone for different telescope aperture shape is in favor to the use of a coronagraph with a circular aperture.

Citation Download Citation

Remi Soummer, Claude Aime, Andre Ferrari, and P. E. Falloon "Improvement of coronagraphy using optimal apodizations", Proc. SPIE 4860, High-Contrast Imaging for Exo-Planet Detection, (3 March 2003); https://doi.org/10.1117/12.457640

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