6 August 2014 Combining vector-phase coronagraphy with dual-beam polarimetry
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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.
© (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Frans Snik, Frans Snik, Gilles Otten, Gilles Otten, Matthew Kenworthy, Matthew Kenworthy, Dimitri Mawet, Dimitri Mawet, Michael Escuti, Michael Escuti, "Combining vector-phase coronagraphy with dual-beam polarimetry", Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 91477U (6 August 2014); doi: 10.1117/12.2055452; https://doi.org/10.1117/12.2055452


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