New pupil masks for high-contrast imaging

Details New pupil masks for high-contrast imaging New pupil masks for high-contrast imaging

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5170...49v&link_type=abstract

Techniques and Instrumentation for Detection of Exoplanets. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 5170,

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Scientific paper

Motivated by the desire to image exosolar planets, recent work by us and others has shown that high-contrast imaging can be achieved using specially shaped pupil masks. To date, our masks have been symmetric with respect to a cartesian coordinate system but were not rotationally invariant, thus requiring that one take multiple images at different angles of rotation about the central point in order to obtain high-contrast in all directions. In this talk, we present two new classes of masks that have rotational symmetry and provide high-contrast in all directions with just one image. These masks provide the required 10-10 level of contrast to within 4 λ/Δ of the central point. They are also well-suited for use on ground-based telescopes, and perhaps NGST as well, since they can accommodate central obstructions and associated support spiders.

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