Apodization and coronagraphy

Details Apodization and coronagraphy Apodization and coronagraphy

Jun 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002sf2a.conf..213a&link_type=abstract

SF2A-2002: Semaine de l'Astrophysique Francaise, meeting held in Paris, France, June 24-29, 2002, Eds.: F. Combes and D. Barret,

Astronomy and Astrophysics

Astrophysics

Scientific paper

Prolate functions are the optimal apodizers for rectangular and circular apertures in stellar coronagraphy. With Roddier's phase mask technique, prolate apodizations can produce a total extinction of the star light. For Lyot's coronagraphy, the extinction, not complete, is surprisingly good for a reasonable mask size. These properties are in principle valid for a monochromatic point source. However a simple device allows to achromatise the system.

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