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Proceedings Paper

The multistage and ring-apodized vortex coronagraph: two simple, small-angle coronagraphic solutions for heavily obscured apertures
Author(s): Dimitri Mawet; Laurent Pueyo; Alexis Carlotti; Bertrand Mennesson; Eugene Serabyn; James Wallace; Pierre Baudoz
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Paper Abstract

Here we present two simple concepts to make the vortex coronagraph (VC) immune to heavily obscured apertures. The multi-stage VC (MSVC) uses the ability of the vortex to move light in and out of apertures through multiple VC in series to restore the nominal attenuation capability of the charge 2 vortex regardless of the aperture obscurations. The ring-apodized VC (RAVC) is a one-stage apodizer exploiting the VC Lyot-plane amplitude distribution in order to perfectly null the diffraction from any central obscuration size, and for any vortex topological charge. In this paper, we also emphasize the complementarity and similarities of the RAVC to the recently proposed Active Compensation of Aperture Discontinuities (ACAD, L. Pueyo et al. 2013, these proceedings) and more finely optimized shaped-pupil-like apodizations (A. Carlotti et al. 2013, these proceedings). This paper ends with a brief discussion about the trade-offs these techniques offer in the framework of the Extremely Large Telescopes (ELT) and the Astrophysics Focused Telescope Assets (AFTA).

Paper Details

Date Published: 26 September 2013
PDF: 15 pages
Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 886411 (26 September 2013); doi: 10.1117/12.2025574
Show Author Affiliations
Dimitri Mawet, European Southern Observatory (Chile)
Jet Propulsion Lab. (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Alexis Carlotti, Princeton Univ. (United States)
IPAG, CNRS, Univ. Joseph Fourier (France)
Bertrand Mennesson, Jet Propulsion Lab. (United States)
Eugene Serabyn, Jet Propulsion Lab. (United States)
James Wallace, Jet Propulsion Lab. (United States)
Pierre Baudoz, LESIA, CNRS, Observatoire de Paris (France)
Univ. Paris 7-Denis Diderot (France)

Published in SPIE Proceedings Vol. 8864:
Techniques and Instrumentation for Detection of Exoplanets VI
Stuart Shaklan, Editor(s)

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