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