Journal
ASTRONOMY & ASTROPHYSICS
Volume 403, Issue 1, Pages 369-381Publisher
E D P SCIENCES
DOI: 10.1051/0004-6361:20030278
Keywords
instrumentation : high angular resolution; techniques : high angular resolution; stars : planetary systems
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This paper presents a generalization of the Roddier & Roddier Phase Mask coronagraph for polychromatic observations. It is shown that using a dual-zone phase mask, combined with complex apodization, both phase and size chromatism can be compensated simultaneously to produce high extinction of a point source over large bandwidths, for example the entire K band with a residual integrated starlight of 3.2 x 10(-4) and a star intensity level of 10(-6) at an angular separation of 3lambda/D. Other advantages of the proposed technique include the compatibility with centrally obscured telescopes, absence of blind axes and no symmetrization of the images.
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