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Proceedings Paper

Experimental results on wavefront correction using the self-coherent camera
Author(s): M. Mas; P. Baudoz; J. Mazoyer; R. Galicher; G. Rousset
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Paper Abstract

The Self-Coherent Camera is dedicated to the direct detection of exoplanets. This instrument can be used as a focal plane wavefront sensor to measure static aberrations that induce speckles on the detector, which prevents the detection of faint companions. The Self-Coherent Camera creates a reference beam in the Lyot stop pupil plane in order to spatially modulate the speckle pattern with Fizeau fringes. We can then estimate for wavefront aberrations upstream of the coronagraphic mask and correct for them using a deformable mirror. Currently, the Self-Coherent Camera is combined with a deformable mirror located in the pupil plane upstream of a Four-Quadrant Phase Mask Coronagraph. In this paper, we present the formalism that explains how the Self-Coherent Camera encodes speckles and how we estimate the wavefront aberrations directly from the science image. We present numerical simulation results on speckle suppression in the focal plane. Then, we give experimental results on wavefront correction on our optical bench using a 32x32 actuators deformable mirror. We show that we can improve the contrast in the focal plane by a factor of more than 100 in the PSF wings up to 12/λD.

Paper Details

Date Published: 24 September 2012
PDF: 12 pages
Proc. SPIE 8446, Ground-based and Airborne Instrumentation for Astronomy IV, 844689 (24 September 2012); doi: 10.1117/12.926586
Show Author Affiliations
M. Mas, Lab. d'Astrophysique de Marseille, CNRS, Aix-Marseille Univ. (France)
LESIA, Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie Paris 6 and Univ. Denis Diderot (France)
P. Baudoz, LESIA, Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie Paris 6 and Univ. Denis Diderot (France)
J. Mazoyer, LESIA, Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie Paris 6 and Univ. Denis Diderot (France)
R. Galicher, Hertzberg Institute of Astrophysics, National Research Council of Canada (Canada)
Univ. de Montréal (Canada)
G. Rousset, LESIA, Observatoire de Paris, CNRS, Univ. Pierre et Marie Curie Paris 6 and Univ. Denis Diderot (France)


Published in SPIE Proceedings Vol. 8446:
Ground-based and Airborne Instrumentation for Astronomy IV
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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