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Paper Abstract

The mid-infrared region is well suited for exoplanet detection thanks to the reduced contrast between the planet and its host star with respect to the visible and near-infrared wavelength regimes. This contrast may be further improved with Vector Vortex Coronagraphs (VVCs), which allow us to cancel the starlight. One flavour of the VVC is the AGPM (Annular Groove Phase Mask), which adds the interesting properties of subwavelength gratings (achromaticity, robustness) to the already known properties of the VVC. In this paper, we present the optimized designs, as well as the expected performances of mid-IR AGPMs etched onto synthetic diamond substrates, which are considered for the E-ELT/METIS instrument.

Paper Details

Date Published: 28 July 2014
PDF: 8 pages
Proc. SPIE 9147, Ground-based and Airborne Instrumentation for Astronomy V, 914799 (28 July 2014); doi: 10.1117/12.2056280
Show Author Affiliations
Brunella Carlomagno, Univ. de Liège (Belgium)
Christian Delacroix, Univ. de Liège (Belgium)
Olivier Absil, Univ. de Liège (Belgium)
Pontus Forsberg, Uppsala Univ. (Sweden)
Serge Habraken, Univ. de Liège (Belgium)
Aïssa Jolivet, Univ. de Liège (Belgium)
Mikael Karlsson, Uppsala Univ. (Sweden)
Dimitri Mawet, European Southern Observatory (Chile)
Pierre Piron, Univ. de Liège (Belgium)
Jean Surdej, Univ. de Liège (Belgium)
Ernesto Vargas Catalan, Uppsala Univ. (Sweden)


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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