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Proceedings Paper

Design optimization and lab demonstration of ZELDA: a Zernike sensor for near-coronagraph quasi-static measurements
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Paper Abstract

The exoplanet direct imagers Gemini/GPI and VLT/SPHERE are built around extreme adaptive optics (ExAO) to correct the atmospheric turbulence and the aberrations associated with the optical surfaces. However, additional strategies are necessary to correct the non-common path aberrations (NCPA) between the ExAO and science paths that can limit the instrument contrast performance. To perform an adequate calibration, we have developed ZELDA, a Zernike sensor to achieve NCPA measurements with nanometric accuracy. We report the results of a new design analysis that maximizes the dynamic range, and from laboratory demonstrations on the LAM high-contrast testbed and on VLT/SPHERE during its integration.

Paper Details

Date Published: 22 August 2014
PDF: 11 pages
Proc. SPIE 9148, Adaptive Optics Systems IV, 91485H (22 August 2014); doi: 10.1117/12.2056818
Show Author Affiliations
Mamadou N'Diaye, Space Telescope Science Institute (United States)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Amandine Caillat, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Anne Costille, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Thierry Fusco, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
ONERA (France)
Aïssa Jolivet, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Institut d'Astrophysique et de Géophysique (Belgium)
Fabrice Madec, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
Laurent Mugnier, ONERA (France)
Baptiste Paul, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
ONERA (France)
Jean-François Sauvage, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
ONERA (France)
Rémi Soummer, Space Telescope Science Institute (United States)
Arthur Vigan, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
J. Kent Wallace, Jet Propulsion Lab. (United States)


Published in SPIE Proceedings Vol. 9148:
Adaptive Optics Systems IV
Enrico Marchetti; Laird M. Close; Jean-Pierre Véran, Editor(s)

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