Improvement of coronagraphy using optimal apodizations

Details Improvement of coronagraphy using optimal apodizations Improvement of coronagraphy using optimal apodizations

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.4860..211s&link_type=abstract

High-Contrast Imaging for Exo-Planet Detection. Edited by Alfred B. Schultz. Proceedings of the SPIE, Volume 4860, pp. 211-220

Computer Science

2

Scientific paper

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.

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