Reference : The four-quadrant ZOG and annular groove phase mask coronagraphs
Scientific congresses and symposiums : Paper published in a book
Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
http://hdl.handle.net/2268/32452
The four-quadrant ZOG and annular groove phase mask coronagraphs
English
Mawet, Dimitri [Univ. of Liege (Belgium)]
Riaud, Pierre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Absil, Olivier mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Baudrand, Jacques [Observatory of Paris-Meudon (France)]
Surdej, Jean mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
1-Aug-2005
Techniques and Instrumentation for Detection of Exoplanets II
Coulter, Daniel R
SPIE
Proceedings of the SPIE, Volume 5905
502-511
No
No
International
Bellingham
WA, USA
Techniques and Instrumentation for Detection of Exoplanets II
SPIE
San Diego
CA, USA
[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.
Researchers ; Professionals
http://hdl.handle.net/2268/32452
10.1117/12.640363
http://adsabs.harvard.edu/abs/2005SPIE.5905..502M

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