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Proceedings Paper

Experimental results of multi-stage four quadrant phase mask coronagraph
Author(s): Pi. Baudoz; F. Assemat; R. Galicher; J. Baudrand; A. Boccaletti
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Paper Abstract

In the framework of exoplanet direct imaging, a few coronagraphs have been proposed to overcome the large flux ratio that exists between the star and its planet. However, there are very few solutions that gather in the same time broad band achromaticity, a small inner working angle (shortest angular distance for planet detection), a good throughput for the planet light, and a mature technical feasibility. Here, we propose to use a combination of chromatic Four Quadrant Phase Mask coronagraphs to achromatize the dephasing of this well-studied monochromatic coronagraph. After describing the principle of the technique, we present preliminary results for a compact prototype. Contrast larger than 10000 are reached with more than 250 nm of spectral bandwidth in the visible. Stability over time and effect of the filtering is also discussed.

Paper Details

Date Published: 20 July 2010
PDF: 10 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 773581 (20 July 2010); doi: 10.1117/12.858273
Show Author Affiliations
Pi. Baudoz, LESIA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
ONERA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
F. Assemat, LESIA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
ONERA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
R. Galicher, LUTH, Observatoire de Paris-Meudon, CNRS (France)
J. Baudrand, LESIA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
ONERA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
A. Boccaletti, LESIA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (France)
ONERA, Observatoire de Paris-Meudon, CNRS, Univ. Paris Diderot (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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