Pupil-remapping Mirrors for a Four-Quadrant Phase Mask Coronagraph

Details Pupil-remapping Mirrors for a Four-Quadrant Phase Mask Coronagraph Pupil-remapping Mirrors for a Four-Quadrant Phase Mask Coronagraph

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasp..117..295m&link_type=abstract

The Publications of the Astronomical Society of the Pacific, Volume 117, Issue 829, pp. 295-299.

Physics

Optics

3

Instrumentation: Miscellaneous, Instrumentation: Adaptive Optics, Instrumentation: High Angular Resolution, Techniques: Miscellaneous, Techniques: High Angular Resolution

Scientific paper

A coronagraph with a four-quadrant phase mask (FQPM) can perfectly eliminate stellar light under ideal conditions. However, the coronagraphic performance is severely degraded in a telescope with a central obscuration. We show that a high-performance FQPM coronagraph can be realized with a centrally obscured telescope by using a two-mirror pupil-remapping system. We calculate the optimal shapes of the remapping mirrors to transform a centrally obscured pupil into clear circular one. The mirror shapes become parabola-like, and the remapping mirrors are shown to provide good coronagraphic performance. The expected performance with adaptive optics systems is also evaluated.

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