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Proceedings Paper

Self-coherent camera: first results of a high-contrast imaging bench in visible light
Author(s): Marion Mas; Pierre Baudoz; Gerard Rousset; Raphaël Galicher; Jacques Baudrand
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Paper Abstract

Extreme adaptive optics and coronagraphy are mandatory for direct imaging of exoplanets. Quasi-static aberrations limit the instrument performance producing speckle noise in the focal plane. We propose a Self-Coherent Camera (SCC) to both control a deformable mirror that actively compensates wavefront error, and calibrate the speckle noise. We create a reference beam to spatially modulate the coronagraphic speckle pattern with Fizeau fringes. In a first step, we are able to extract wavefront aberrations from the science image and correct for them using a deformable mirror. In a second step, we apply a post-processing algorithm to discriminate the companion image from the residual speckle field. To validate the instrumental concept, we developed a high contrast imaging bench in visible light. We associated a SCC to a four quadrant phase mask coronagraph and a deformable mirror (DM) with a high number of actuators (32x32 Boston Michromachines MEMS). We will present this bench and show first experimental results of focal plane wavefront sensing and high contrast imaging. The measurements are compared to numerical simulations.

Paper Details

Date Published: 20 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773566 (20 July 2010); doi: 10.1117/12.857898
Show Author Affiliations
Marion Mas, LESIA, CNRS, Observatoire de Paris-Meudon (France)
Pierre Baudoz, LESIA, CNRS, Observatoire de Paris-Meudon (France)
Gerard Rousset, LESIA, CNRS, Observatoire de Paris-Meudon (France)
Raphaël Galicher, Lab. Univ. et Theorie, CNRS, Observatoire de Paris-Meudon (France)
Jacques Baudrand, LESIA, CNRS, Observatoire de Paris-Meudon (France)

Published in SPIE Proceedings Vol. 7735:
Ground-based and Airborne Instrumentation for Astronomy III
Ian S. McLean; Suzanne K. Ramsay; Hideki Takami, Editor(s)

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