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Proceedings Paper

Active correction of aperture discontinuities (ACAD) for space telescope pupils: a parametic analysis
Author(s): Johan Mazoyer; Laurent Pueyo; Colin Norman; Mamadou N'Diaye; Dimitri Mawet; Rémi Soummer; Marshall Perrin; Élodie Choquet; Alexis Carlotti
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Paper Abstract

As the performance of coronagraphs improves, the achievable contrast is more and more dependent of the shape of the pupil. The future generation of space and ground based coronagraphic instruments will have to achieve high contrast levels on on-axis and/or segmented telescopes. To correct for the high amplitude aberrations introduced by secondary mirror structures and segmentation of the primary mirror, we explore a two deformable mirror (DM) method. The major difficulty of several DM methods is the non-linear relation linking actuator strokes to the point spread function in the coronagraph focal plane. The Active Compensation of Aperture Discontinuities (ACAD) method is achieving this minimization by solving a non linear differential Monge Ampere equation. Once this open loop method have reached the minimum, a close-loop stroke minimization method can be applied to correct for phase and amplitude aberrations to achieve the ultimate contrast. In this paper, I describe the results of the parametric analysis that that I have undertaken on this method. After recalling the principle of the method, I will described the explored parameter space (deformable mirror set-up, shape of the pupil, bandwidth, coronagraph designs). I will precisely described the way I simulated the Vortex coronagraph for this numerical simulation. Finally I will present the preliminary results of this parametric analysis for space telescope pupils only.

Paper Details

Date Published: 16 September 2015
PDF: 13 pages
Proc. SPIE 9605, Techniques and Instrumentation for Detection of Exoplanets VII, 96050M (16 September 2015); doi: 10.1117/12.2188692
Show Author Affiliations
Johan Mazoyer, Space Telescope Science Institute (United States)
Laurent Pueyo, Space Telescope Science Institute (United States)
Colin Norman, Johns Hopkins Univ. (United States)
Mamadou N'Diaye, Space Telescope Science Institute (United States)
Dimitri Mawet, California Institute of Technology (United States)
Rémi Soummer, Space Telescope Science Institute (United States)
Marshall Perrin, Space Telescope Science Institute (United States)
Élodie Choquet, Space Telescope Science Institute (United States)
Alexis Carlotti, Institut de Planétologie et d’Astrophysique de Grenoble (France)

Published in SPIE Proceedings Vol. 9605:
Techniques and Instrumentation for Detection of Exoplanets VII
Stuart Shaklan, Editor(s)

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