Subwavelength gratings for phase mask coronagraphy: the 4QZOG and AGPM coronagraphs
- Creators
-
Mawet, Dimitri
- Riaud, Pierre
- Others:
- Aime, C.
- Vakili, F.
Abstract
We present two new phase mask coronagraphs implemented with subwavelength diffractive optical elements. The first one is an evolution of the four quadrant phase mask coronagraph (FQPM), which resolves the π phase shift chromaticity issue: 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". The potential performances of the 4QZOG and AGPM coronagraph are very good, ensuring, for instance, a theoretical contrast of 1.4 x 10^(-7) at 3λ/D over the whole K band. These coronagraphs could be used alone on single-pupil telescopes either in space or on the ground (with an adaptive optics system) to detect exoplanets.
Additional Information
© 2006 International Astronomical Union. Cambridge University Press. Provided by the NASA Astrophysics Data System. D. Mawet and P. Riaud acknowledges the financial support of the Belgian "Fonds pour la formation a la Recherche dans l'Industrie et dans l' Agriculture" and the "Pole d' Attraction Inter-Universitaire", respectively.Attached Files
Published - 2006dies_conf__361M.pdf
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Additional details
- Eprint ID
- 57688
- Resolver ID
- CaltechAUTHORS:20150520-090059986
- Fonds pour la formation a la Recherche dans l'Industrie et dans l' Agriculture (Belgian)
- Pole d' Attraction Inter-Universitaire (Belgian)
- Created
-
2015-05-20Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Series Name
- IAU Symposium and Colloquium Proceedings Series
- Series Volume or Issue Number
- 200