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Cascading properties of Prolate Apodized Lyot Coronagraphs

Published online by Cambridge University Press:  11 October 2004

C. Aime ,
R. Soummer ,
C. Aime  and
R. Soummer
C. Aime
Affiliation:
UMR 6525 Laboratoire Universitaire d'Astrophysique de Nice, University of Nice Sophia-Antipolis, 06108 Nice Cedex 2, France
R. Soummer
Affiliation:
Space Telescope Science Institute, 3700 San Martin Drive, Baltimore MD21218, USA
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Abstract

We describe in this short note the interest of a multiple-stageprolate apodized Lyot coronagraph (PALC). The principle wasproposed by Aime, Soummer and Ferrari (A&A 2002, 389,334-344).Several PALCs are used in a cascading mode. The first stage is aPALC with all its elements. The other stages use only Lyot masksand Lyot stops, without any further aperture apodization. If theextinction factor of the first PALC is Q, then the resultingextinction factor of N such cascading coronagraphs is QN.The total throughput remains that of the first PALC, for perfectoptics.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 12: Astronomy with High Contrast Imaging II , 2004 , pp. 281 - 286
Copyright
© EAS, EDP Sciences, 2004

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