The multistage and ring-apodized vortex coronagraph: two simple, small-angle coronagraphic solutions for heavily obscured apertures

Dimitri Mawet; Laurent Pueyo; Alexis Carlotti; Bertrand Mennesson; Eugene Serabyn; James Wallace; Pierre Baudoz

doi:10.1117/12.2025574

26 September 2013 The multistage and ring-apodized vortex coronagraph: two simple, small-angle coronagraphic solutions for heavily obscured apertures

Dimitri Mawet, Laurent Pueyo, Alexis Carlotti, Bertrand Mennesson, Eugene Serabyn, James Wallace, Pierre Baudoz

Author Affiliations +

Proceedings Volume 8864, Techniques and Instrumentation for Detection of Exoplanets VI; 886411 (2013) https://doi.org/10.1117/12.2025574
Event: SPIE Optical Engineering + Applications, 2013, San Diego, California, United States

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).

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Dimitri Mawet, Laurent Pueyo, Alexis Carlotti, Bertrand Mennesson, Eugene Serabyn, James Wallace, and Pierre Baudoz "The multistage and ring-apodized vortex coronagraph: two simple, small-angle coronagraphic solutions for heavily obscured apertures", Proc. SPIE 8864, Techniques and Instrumentation for Detection of Exoplanets VI, 886411 (26 September 2013); https://doi.org/10.1117/12.2025574

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