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Proceedings Paper

The four-quadrant ZOG and annular groove phase mask coronagraphs
Author(s): Dimitri Mawet; Pierre Riaud; Olivier Absil; Jacques Baudrand; Jean Surdej
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Paper Abstract

Phase mask coronagraphy is a technique aiming at accommodating both high dynamic and high angular resolution imaging of faint sources around bright objects such as exo-planets orbiting their parent stars or host galaxies around Active Galactic Nuclei. We present two new phase mask coronagraphs implemented with subwavelength diffractive optical elements consisting of optimized surface-relief gratings. The first one is an evolution of the Four Quadrant Phase Mask coronagraph, which resolves the π phase shift chromaticity problem: the Four Quadrant Zeroth Order Grating (4QZOG). The second one is a totally new design consisting of an optical vortex induced by a space-variant grating: the Annular Groove Phase Mask (AGPM) coronagraph is fully symmetric and free from any "shaded zones". Some manufacturing hints are given.

Paper Details

Date Published: 5 October 2005
PDF: 10 pages
Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59051N (5 October 2005); doi: 10.1117/12.640363
Show Author Affiliations
Dimitri Mawet, Univ. of Liege (Belgium)
Pierre Riaud, Univ. of Liege (Belgium)
Olivier Absil, Univ. of Liege (Belgium)
Jacques Baudrand, Observatory of Paris-Meudon (France)
Jean Surdej, Univ. of Liege (Belgium)

Published in SPIE Proceedings Vol. 5905:
Techniques and Instrumentation for Detection of Exoplanets II
Daniel R. Coulter, Editor(s)

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