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Achromatic Four Quadrant Phase Mask Coronagraph using the Dispersion of Form Birefringence
Mawet, D.; Lenaerts, Cedric; Moreau, V. et al.
2003In Aime, Claude; Soummer, Rémi (Eds.) Astronomy with high contrast imaging : from planetary systems to active galactic nuclei
 

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Keywords :
4-quadrant phase mask coronagraph
Abstract :
[en] We describe an alternative design for the 4-quadrant phase mask coronagraph described recently by Rouan et al. (2000). Based on the same principle, i.e. producing a very efficient nulling by mutually destructive interferences of the coherent light from the main source, our mask realises the Ï phase shift using some properties of ZOGs (Zeroth Order Gratings) and according to an original scheme respecting the 4-quadrant symmetry. When the period of the one-dimension grating structure is smaller than the wavelength of the incident light, the structure becomes birefringent. The effective refractive indices depend on the wavelength. Using this feature, we can design a mask whose nulling efficiency is maintained within a wide wavelength range. Numerical simulations were made according to the RCWA (Rigorous Coupled Wave Analyses).
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Mawet, D.;  IAGL, Université de Liège, 17, B5C Allée du 6 Août, 4000 Sart Tilman, Belgium
Lenaerts, Cedric ;  Université de Liège - ULiège > CSL (Centre Spatial de Liège)
Moreau, V.;  HOLOLAB, Université de Liège, 17, B5 Allée du 6 Août, 4000 Sart Tilman, Belgium
Renotte, Yvon  ;  Université de Liège - ULiège > Département de physique > Optique - Hololab
Rouan, D.;  DESPA, Observatoire de Paris-Meudon, 5 Pl. J. Janssen, 92195 Meudon, France
Surdej, Jean  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Language :
English
Title :
Achromatic Four Quadrant Phase Mask Coronagraph using the Dispersion of Form Birefringence
Alternative titles :
[en] Achromatic Four Quadrant Phase Mask Coronagraph using the Dispersion of Form Birefringence
Publication date :
28 May 2003
Event name :
Astronomy with high contrast imaging : from planetary systems to active galactic nuclei
Event organizer :
EAS Publications Series
Event place :
Nice, France
Event date :
13 May 2002 16 May 2002
Audience :
International
Main work title :
Astronomy with high contrast imaging : from planetary systems to active galactic nuclei
Author, co-author :
Aime, Claude
Soummer, Rémi
Publisher :
EAS
Edition :
EAS, EDP Sciences, 2003
Collection name :
EAS Publications Series, 8 (2003)
Pages :
117-128
Available on ORBi :
since 11 January 2018

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