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9 September 2019 The multiple-grating vector vortex coronagraph (Conference Presentation)
Frans Snik, David Doelman, Steven Bos, Mireille Ouellet, Michael Escuti, Garreth Ruane
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Proceedings Volume 11117, Techniques and Instrumentation for Detection of Exoplanets IX; 1111713 (2019) https://doi.org/10.1117/12.2529554
Event: SPIE Optical Engineering + Applications, 2019, San Diego, California, United States
Abstract
The contrast/bandwidth performance for current implementations of the Vector Vortex Coronagraph (VVC) is degraded by a leakage term that emerges when the optic does not exhibit a retardance of exactly half-wave. We present a novel implementation for the VVC that significantly rejects the polarization leakage term through diffraction. The optic consists of multiple separate layers of patterned liquid crystals, for which each extra layer adds two orders of magnitude of leakage rejection. The first layer combines a vortex pattern and a polarization grating into a so-called forked grating that splits the circular polarization states. Consecutive polarization gratings effectively cancel the first grating with full diffraction direction efficiency, resulting in a regular vortex phase with minimized leakage of the non-coronagraphic PSF. We present the designs and performance of double-grating VVC for the ground-based instruments VLT/SPHERE and Subaru/SCExAO, that instantaneously cover 1-2.5 um. In addition, we introduce the triple-grating VVC that fulfills the stringent requirements for technology demonstration towards high-contrast imaging at ~1E-10 levels with future space telescopes like the HabEx and LUVOIR mission concepts.
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Frans Snik, David Doelman, Steven Bos, Mireille Ouellet, Michael Escuti, and Garreth Ruane "The multiple-grating vector vortex coronagraph (Conference Presentation)", Proc. SPIE 11117, Techniques and Instrumentation for Detection of Exoplanets IX, 1111713 (9 September 2019); https://doi.org/10.1117/12.2529554
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KEYWORDS
Coronagraphy
Diffraction gratings
Polarization
Diffraction
Liquid crystals
Point spread functions
Space telescopes
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