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Proceedings Paper

Combining vector-phase coronagraphy with dual-beam polarimetry
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Paper Abstract

Utilizing the so-called vector phase of polarized light, both focal-plane coronagraphs (e.g. the Vector Vortex Coronagraph) and pupil-plane coronagraphs (e.g. the vector Apodizing Phase Plate) are powerful components for high-contrast imaging. These coronagraphs can be built and optimized with polarization techniques and liquid crystal technology, that enable patterning at the micron level and furnish broad-band performance. The contrast between the residual starlight and the (polarized) reflected light off exoplanets can be further bridged by incorporating sensitive, dual-beam imaging polarimetry. As vector-phase coronagraphs use polarizers to enhance their performance, we introduce optimally integrated solutions that combine advanced coronagraphy and polarimetry. For both the VVC and the vAPP we present polarization beam-splitting concepts, with polarization analyzers either behind or in front of the coronagraphic optics. We discuss design solutions for the implementation of polarization optics, and set the stage for a trade-off between the improvement of coronagraphic and polarimetric performance and the ensuing degradation on the high-contrast imaging performance due to wavefront errors.

Paper Details

Date Published: 6 August 2014
PDF: 12 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477U (6 August 2014); doi: 10.1117/12.2055452
Show Author Affiliations
Frans Snik, Leiden Observatory, Leiden Univ. (Netherlands)
Gilles Otten, Leiden Observatory, Leiden Univ. (Netherlands)
Matthew Kenworthy, Leiden Observatory, Leiden Univ. (Netherlands)
Dimitri Mawet, European Southern Observatory (Chile)
Michael Escuti, North Carolina State Univ. (United States)

Published in SPIE Proceedings Vol. 9147:
Ground-based and Airborne Instrumentation for Astronomy V
Suzanne K. Ramsay; Ian S. McLean; Hideki Takami, Editor(s)

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