Computer Science – Performance
Scientific paper
Jun 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007lyot.confe..25p&link_type=abstract
Proceedings of the conference In the Spirit of Bernard Lyot: The Direct Detection of Planets and Circumstellar Disks in the 21s
Computer Science
Performance
Scientific paper
A key design feature of a conventional coronagraph is an opaque occulting mask placed in the image plane of a telescope. Unlike the conventional coronagraph, a holographic vortex coronagraph (HVC) makes use of a blazed vortex grating instead of an opaque occulting mask. A wave front incident perpendicular to the grating is transformed into a helix in the first diffracted order. Total destructive interference occurs along the axis of the helix attenuating an on-axis source. An HVC is naturally achromatic: the impinging phase front is transformed into the same helical shape regardless of wavelength. In this talk I will compare the broadband performance of an HVC with that of a conventional coronagraph. I will discuss limitations to the technique and ways to improve upon it. Extreme-AO upgrade of the HiCIAO instrument for Subaru Telescope is cur-rently being developed and includes a PIAA coronagraph.
Palacios David
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