Achromatic dual-zone reflecting phase mask for stellar coronagraphy

Details Achromatic dual-zone reflecting phase mask for stellar coronagraphy Achromatic dual-zone reflecting phase mask for stellar coronagraphy

Oct 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.539..599s&link_type=abstract

In: Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, 22-25 A

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Coronagraphy, Extrasolar Planets

Scientific paper

The dual-zone phase mask (DZPM) is a generalization of the Roddier and Roddier phase mask coronagraph for polychromatic observations. It consists of two concentric phase masks: a disk surrounded by a second annular phase mask. We consider here pure reflecting masks. The values of the mask thickness are optimized numerically to obtain an optimal nulling over a given large bandwidth. The DZPM presents the advantage of being insensitive to central obscuration of telescopes.

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