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

Mamadou N'Diaye; Kjetil Dohlen; Amandine Caillat; Anne Costille; Thierry Fusco; Aïssa Jolivet; Fabrice Madec; Laurent Mugnier; Baptiste Paul; Jean-François Sauvage; Rémi Soummer; Arthur Vigan; J. Kent Wallace

doi:10.1117/12.2056818

22 August 2014 Design optimization and lab demonstration of ZELDA: a Zernike sensor for near-coronagraph quasi-static measurements

Mamadou N'Diaye, Kjetil Dohlen, Amandine Caillat, Anne Costille, Thierry Fusco, Aïssa Jolivet, Fabrice Madec, Laurent Mugnier, Baptiste Paul, Jean-François Sauvage, Rémi Soummer, Arthur Vigan, J. Kent Wallace

Author Affiliations +

Proceedings Volume 9148, Adaptive Optics Systems IV; 91485H (2014) https://doi.org/10.1117/12.2056818
Event: SPIE Astronomical Telescopes + Instrumentation, 2014, Montréal, Quebec, Canada

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.

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Mamadou N'Diaye, Mamadou N'Diaye, Kjetil Dohlen, Kjetil Dohlen, Amandine Caillat, Amandine Caillat, Anne Costille, Anne Costille, Thierry Fusco, Thierry Fusco, Aïssa Jolivet, Aïssa Jolivet, Fabrice Madec, Fabrice Madec, Laurent Mugnier, Laurent Mugnier, Baptiste Paul, Baptiste Paul, Jean-François Sauvage, Jean-François Sauvage, Rémi Soummer, Rémi Soummer, Arthur Vigan, Arthur Vigan, J. Kent Wallace, J. Kent Wallace, } "Design optimization and lab demonstration of ZELDA: a Zernike sensor for near-coronagraph quasi-static measurements", Proc. SPIE 9148, Adaptive Optics Systems IV, 91485H (22 August 2014); doi: 10.1117/12.2056818; https://doi.org/10.1117/12.2056818

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