Physics
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confr..24c&link_type=abstract
Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s
Physics
2
Scientific paper
Apodization of a telescope PSF by applying a phase profile across the pupil has been proven in the lab and on the sky at the MMT. A great advantage to using phase apodization is that a coronagraph capability can be provided within an instrument with only a phase plate included in a pupil filter wheel, without the need for a Lyot stop or special stabilization of the image on a focal plane mask. The phase masks used up until now have been based on either ad hoc designs or iterative approaches based on simple notions of anti-speckle steering. The iterative design algorithms are related to closed loop halo suppression algorithms with inherent limitations that eventually limit the suppression and may unnecessarily reduce the Strehl ratio and core encircled energy. This paper presents a new algorithm for designing apodizing phase plates which has much better control of the dark search region in the focal plane, with closer inner working angles, deeper halo suppression, and better control of the PSF core and Strehl ratio. The limits of suppression depth, inner working angle, Strehl ratio vs. suppressed halo power, and chromatic limitations are presented.
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