Subwavelength surface-relief gratings for stellar coronagraphy

[en] We present a new design of a phase mask coronagraph implemented with subwavelength diffractive optical elements consisting of optimized surface-relief gratings. Phase mask coronagraphy is a recent technique that seeks to accommodate both high dynamic and high angular resolution imaging of faint sources around bright astrophysical objects such as exoplanets orbiting their host stars. The original design we propose is a new, integrated, and flexible solution to the pi phase-shift chromaticity of the phase mask coronagraphs. It will allow broadband observations, i.e., shorter integration times and object characterizations, by means of spectroscopic analysis. The feasibility of the component manufacturing is also considered through a tolerance study.

Disciplines :

Space science, astronomy & astrophysics

Author, co-author :

Mawet, Dimitri

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

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

Baudrand, Jacques

Language :

English

Title :

Subwavelength surface-relief gratings for stellar coronagraphy

Publication date :

01 December 2005

Journal title :

Applied Optics

ISSN :

1559-128X

eISSN :

2155-3165

Publisher :

Optical Society of America, Washington, United States - District of Columbia

Volume :

44 Issue 34

Pages :

7313-7321

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://adsabs.harvard.edu/abs/2005ApOpt..44.7313M

Available on ORBi :

since 07 July 2010

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