ORBi: Mawet Dimitri - The four-quadrant ZOG and annular groove phase mask coronagraphs

Reference : The four-quadrant ZOG and annular groove phase mask coronagraphs


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/32452

Title :	The four-quadrant ZOG and annular groove phase mask coronagraphs
Language :	English
Author, co-author :	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 [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 [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS) >]
Publication date :	1-Aug-2005
Main document title :	Techniques and Instrumentation for Detection of Exoplanets II
Editor :	Coulter, Daniel R
Publisher :	SPIE
Collection and collection volume :	Proceedings of the SPIE, Volume 5905
Pages :	502-511
On invitation :	No
Audience :	International
City :	Bellingham
Country :	WA, USA
Event name :	Techniques and Instrumentation for Detection of Exoplanets II
Event organizer :	SPIE
Event place (city) :	San Diego
Event country :	CA, USA
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.
Target :	Researchers ; Professionals
Permalink :	http://hdl.handle.net/2268/32452
DOI :	10.1117/12.640363
Other URL :	http://adsabs.harvard.edu/abs/2005SPIE.5905..502M

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