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

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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

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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, Kjetil Dohlen, Amandine Caillat, Anne Costille, Thierry Fusco, Aïssa Jolivet, Fabrice Madec, Laurent Mugnier, Baptiste Paul, Jean-François Sauvage, Rémi Soummer, Arthur Vigan, and 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); https://doi.org/10.1117/12.2056818

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