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Proceedings Paper

Lab results of the circular phase mask concepts for high-contrast imaging of exoplanets
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Paper Abstract

Circular phase mask concepts represent promising options for high contrast imaging and spectroscopy of exo-planets. Depending on their design, they can either work as a diffraction suppression system or as a focal plane wavefront sensor. While the apodized Roddier coronagraph uses a π-phase mask to obtain complete suppression of the star image in monochromatic light, the Zernike sensor uses a π/2-phase mask to measure the residual aberrations in the focal plane by encoding them into intensity variations in the relayed pupil. Implementations of the Zernike sensor can be considered in exoplanet imagers such as VLT-SPHERE, Gemini planet imager, Palomar-P1640 or Subaru-SCExAO to enlarge their capabilities. However, such concepts have not been validated experimentally up to now. Our goal is to perform lab demonstration of this concept on our visible coronagraph testbed at LAM and to propose an upgrade design for SPHERE. In this communication, we report on results of lab measurements of the Zernike sensor and determine its sensitivity to small wavefront errors.

Paper Details

Date Published: 13 September 2012
PDF: 9 pages
Proc. SPIE 8450, Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II, 84500N (13 September 2012); doi: 10.1117/12.926876
Show Author Affiliations
Mamadou N'Diaye, Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France)
Thierry Fusco, ONERA (France)
Kacem El Hadi, Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France)
Rémi Soummer, Space Telescope Science Institute (United States)
Salvador Cuevas, Instituto de Astronomía, Univ. Nacional Autónoma de México (Mexico)
Myriam Zerrad, Institut Fresnel, CNRS, Univ. d'Aix-Marseille (France)
Marc Ferrari, Lab. d'Astrophysique de Marseille, CNRS, Univ. d'Aix-Marseille (France)


Published in SPIE Proceedings Vol. 8450:
Modern Technologies in Space- and Ground-based Telescopes and Instrumentation II
Ramón Navarro; Colin R. Cunningham; Eric Prieto, Editor(s)

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