Achromatic dual-zone phase mask stellar coronagraph

Details Achromatic dual-zone phase mask stellar coronagraph Achromatic dual-zone phase mask stellar coronagraph

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003a%26a...403..369s&link_type=abstract

Astronomy and Astrophysics, v.403, p.369-381 (2003)

Astronomy and Astrophysics

Astrophysics

27

Instrumentation: High Angular Resolution, Techniques: High Angular Resolution, Stars: Planetary Systems

Scientific paper

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 3.2x 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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