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Proceedings Paper

Apodized Lyot coronagraph for VLT-SPHERE: laboratory tests and performances of a first prototype in the visible
Author(s): Géraldine Guerri; Sylvie Robbe-Dubois; Jean-Baptiste Daban; Lyu Abe; Richard Douet; Philippe Bendjoya; Farrokh Vakili; Marcel Carbillet; Jean-Luc Beuzit; Pascal Puget; Kjetil Dohlen; David Mouillet
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Paper Abstract

We present some of the High Dynamic Range Imaging activities developed around the coronagraphic test-bench of the Laboratoire A. H. Fizeau (Nice). They concern research and development of an Apodized Lyot Coronagraph (ALC) for the VLT-SPHERE instrument and experimental results from our testbed working in the visible domain. We determined by numerical simulations the specifications of the apodizing filter and searched the best technological process to manufacture it. We present the results of the experimental tests on the first apodizer prototype in the visible and the resulting ALC nulling performances. The tests concern particularly the apodizer characterization (average transmission radial profile, global reflectivity and transmittivity in the visible), ALC nulling performances compared with expectations, sensitivity of the ALC performances to misalignments of its components.

Paper Details

Date Published: 23 July 2008
PDF: 12 pages
Proc. SPIE 7014, Ground-based and Airborne Instrumentation for Astronomy II, 70143J (23 July 2008); doi: 10.1117/12.789688
Show Author Affiliations
Géraldine Guerri, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Sylvie Robbe-Dubois, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Jean-Baptiste Daban, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Lyu Abe, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Richard Douet, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Philippe Bendjoya, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Farrokh Vakili, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Marcel Carbillet, Lab. A.H. Fizeau, CNRS, Univ. de Nice Sophia-Antipolis (France)
Jean-Luc Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble, CNRS, Univ. J. Fourier (France)
Pascal Puget, Lab. d'Astrophysique de l'Observatoire de Grenoble, CNRS, Univ. J. Fourier (France)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, Observatoire Astronomique de Marseille Provence (France)
David Mouillet, Lab. d'Astrophysique de l'Observatoire de Grenoble, CNRS, Univ. J. Fourier (France)


Published in SPIE Proceedings Vol. 7014:
Ground-based and Airborne Instrumentation for Astronomy II
Ian S. McLean; Mark M. Casali, Editor(s)

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