The four-quadrant ZOG and annular groove phase mask coronagraphs

Dimitri Mawet; Pierre Riaud; Olivier Absil; Jacques Baudrand; Jean Surdej

doi:10.1117/12.640363

5 October 2005 The four-quadrant ZOG and annular groove phase mask coronagraphs

Dimitri Mawet, Pierre Riaud, Olivier Absil, Jacques Baudrand, Jean Surdej

Proceedings Volume 5905, Techniques and Instrumentation for Detection of Exoplanets II; 59051N (2005) https://doi.org/10.1117/12.640363
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

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.

Citation Download Citation

Dimitri Mawet, Pierre Riaud, Olivier Absil, Jacques Baudrand, and Jean Surdej "The four-quadrant ZOG and annular groove phase mask coronagraphs", Proc. SPIE 5905, Techniques and Instrumentation for Detection of Exoplanets II, 59051N (5 October 2005); https://doi.org/10.1117/12.640363

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