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Paper Abstract

New space missions dedicated to exoplanet imaging will rely on coronagraphs to address the high contrast between the stars and their environments. In order to avoid the image of planets to be lost in post-coronagraphic starlight residuals, high precision wavefront sensing and control is a key element to these missions. We present recent results of simultaneous post-coronagraphic phase and amplitude sensing obtained on the THD bench using the coronagraphic phase diversity. We also present results of simulation studies on the non-linear dark hole technique to assess the main limitations of this technique. Finally, we present a first experimental validation of its principle and corroborate expectations on its speed of convergence. These results suggest that the non-linear dark hole is a good candidate for wave-front control for future space-based exoplanet imaging missions, where fast techniques to produce deep dark holes are of paramount importance.

Paper Details

Date Published: 12 July 2018
PDF: 14 pages
Proc. SPIE 10703, Adaptive Optics Systems VI, 1070329 (12 July 2018); doi: 10.1117/12.2314100
Show Author Affiliations
Olivier Herscovici-Schiller, ONERA (France)
Laurent M. Mugnier, ONERA (France)
Pierre Baudoz, LESIA, Observatoire de Paris, PSL Research Univ., CNRS Sorbonne Univ., UPCM,Univ. Paris Diderot (France)
Raphaël Galicher, LESIA, Observatoire de Paris, PSL Research Univ., CNRS, Sorbonne Univ., UPCM, Univ. Paris Diderot (France)
Jean-François Sauvage, ONERA (France)
Lab. d'Astrophysique de Marseille (France)
Fabien Patru, LESIA, Observatoire de Paris, PSL Research Univ., CNRS, Sorbonne Univ., UPCM, Univ. Paris Diderot (France)
Lucie Leboulleux, ONERA (France)
Space Telescope Science Institute (United States)
Lab. d’astrophysique de Marseille (France)
Arthur Vigan, Lab. d'Astrophysique de Marseille (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille (France)
Thierry Fusco, ONERA (France)
Lab. d’Astrophysique de Marseille (France)
Laurent Pueyo, Space Telescope Science Institute (United States)
Rémi Soummer, Space Telescope Science Institute (United States)
Jean-Michel Le Duigou, Ctr. National d'Études Spatiales (France)


Published in SPIE Proceedings Vol. 10703:
Adaptive Optics Systems VI
Laird M. Close; Laura Schreiber; Dirk Schmidt, Editor(s)

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