Computer Science
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007spie.6693e..43k&link_type=abstract
Techniques and Instrumentation for Detection of Exoplanets III. Edited by Coulter, Daniel R. Proceedings of the SPIE, Volume 66
Computer Science
Scientific paper
Practical band-limited occulting masks used in visible-light Lyot coronagraphs, such as those proposed for the Terrestrial Planet Finder Coronagraph (TPF-C), will exhibit some non-band-limited transmission errors that may limit their observing contrast ratios to unacceptable levels. The complex (both phase and amplitude) transmission profiles of these masks exhibit large dynamic ranges over small spatial scales, which are difficult to probe using ordinary optical microscopes and interferometers. We describe here a technique for making these complex transmission measurements with the mask in-place in a Lyot coronagraph, using point-source images taken in the focal and pupil planes, with the Lyot stop removed. We also present measurements taken from the High-Contrast Imaging Testbed (HCIT) at JPL.
Kern Brian
Wilson Daniel W.
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