EAS Publications Series
Volume 22, 2006Astronomy with High Contrast Imaging III: Instrumental Techniques, Modeling and Data Processing
|Page(s)||239 - 251|
|Published online||13 October 2006|
M. Carbillet, A. Ferrari and C. Aime (eds)
EAS Publications Series, 22 (2006) 239-251
Achromatic Prolate Coronagraph using Interferometric Apodisations
MAE Department, Princeton University, Princeton, NJ 08544, USA
2 UMR 6525 Astrophysique, Université de Nice Sophia Antipolis, Parc Valrose, 06108 Nice Cedex 2, France
3 Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA
Recent developments in coronagraphy have increased the reachable dynamic range limit of telescopes and thus opened the possibility for the imaging of fainter and fainter companions. They rely on a series of modifications of the original concept involving amplitude and phase masks in either the pupil or the image plane. They are designed to operate optimally at one wavelength. In this paper we first study the chromatic leakage in Pupil Apodised Lyot Coronagraphs and then present a theoretical solution that create a polychromatic null while maximizing the photon flux from the companion. Finally we discuss a promising experimental implementation of this solution using interferometric apodisations.
© EAS, EDP Sciences, 2006
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