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Proceedings Paper

Wavelength-dependent complex transmission profiles of band-limited coronagraph occulting masks measured in situ
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Paper Abstract

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.

Paper Details

Date Published: 19 September 2007
PDF: 10 pages
Proc. SPIE 6693, Techniques and Instrumentation for Detection of Exoplanets III, 66931F (19 September 2007); doi: 10.1117/12.733949
Show Author Affiliations
Brian Kern, Jet Propulsion Lab. (United States)
Daniel W. Wilson, Jet Propulsion Lab. (United States)

Published in SPIE Proceedings Vol. 6693:
Techniques and Instrumentation for Detection of Exoplanets III
Daniel R. Coulter, Editor(s)

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