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Proceedings Paper

Stellar coronagraphs for telescopes with arbitrary pupils
Author(s): Johanan L. Codona
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Paper Abstract

Traditional coronagraph design is reviewed and extended to the case of arbitrary pupil geometries with adaptive optics (AO). By selecting a desired focal plane occulting mask and specifying the expected Strehl ratio achieved by the AO system, the design for a matched Lyot stop is given. The outline of the optimum Lyot stop is derived using general considerations of the residual halo from an on-axis source, as well as by maximizing the signal-to-noise ratio. A continuous transmission variant of the optimum Lyot stop is also found by means of a heuristic argument. It is suggested that essentially the same result may be found using a matched-filter analog from signal processing theory. The resulting Lyot stops for multi-segment telescope apertures can be quite unexpected, and a case with six circular segments is considered as an example.

Paper Details

Date Published: 24 December 2003
PDF: 10 pages
Proc. SPIE 5169, Astronomical Adaptive Optics Systems and Applications, (24 December 2003); doi: 10.1117/12.530013
Show Author Affiliations
Johanan L. Codona, Steward Observatory/Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 5169:
Astronomical Adaptive Optics Systems and Applications
Robert K. Tyson; Michael Lloyd-Hart, Editor(s)

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