The four-quadrant ZOG and annular groove phase mask coronagraphs

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

doi:10.1117/12.640363

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The four-quadrant ZOG and annular groove phase mask coronagraphs

Mawet, Dimitri; Riaud, Pierre; Absil, Olivier et al.

2005 • In Coulter, Daniel R (Ed.) Techniques and Instrumentation for Detection of Exoplanets II

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https://hdl.handle.net/2268/32452

DOI
10.1117/12.640363

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Abstract :

[en] 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 Ï 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.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Mawet, Dimitri; Univ. of Liege (Belgium)

Riaud, Pierre ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Absil, Olivier ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Baudrand, Jacques; Observatory of Paris-Meudon (France)

Surdej, Jean ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)

Language :

English

Title :

The four-quadrant ZOG and annular groove phase mask coronagraphs

Publication date :

01 August 2005

Event name :

Techniques and Instrumentation for Detection of Exoplanets II

Event organizer :

SPIE

Event place :

San Diego, United States - California

Audience :

International

Main work title :

Techniques and Instrumentation for Detection of Exoplanets II

Editor :

Coulter, Daniel R

Publisher :

SPIE, Bellingham, United States - Washington

Collection name :

Proceedings of the SPIE, Volume 5905

Pages :

502-511

Additional URL :

http://adsabs.harvard.edu/abs/2005SPIE.5905..502M

Available on ORBi :

since 14 December 2009

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