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Proceedings Paper

FOROS: Fresnel optical propagation code for SPHERE
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Paper Abstract

SPHERE (Spectro-Polarimetric High-contrast Exoplanet Research) is VLT instrument for the discovery and study of new extra-solar giant planets orbiting nearby stars by direct imaging of their circumstellar environment. SPHERE is a complex instrument containing more than 50 optical surfaces. The optical imperfections of each of these surfaces might influence the final contrast. SPHERE has several observing modes in Visible and Infrared, and therefore several optical paths. FOROS is an end-to-end optical propagation code for SPHERE, which includes almost all surfaces of the instrument. It models the instrument by the sequential blocks: VLT, Foreoptics, Corrective Optics, Coronagraph and so on, such that the beam quality can be studied at several selected locations. The Vis and IR paths are separated in the model. It incorporates the real data of surface measurement, according to the availability of this data. Each surface error can be switched on and off; therefore the influence of each surface on the contrast can be studied independently. FOROS is an IDL-PROPER-based code, the main power of which is Fresnel propagation. Therefore it represents a numerical tool to study the Fresnel diffraction effects in SPHERE. In the paper we describe the structure and philosophy of the code. The phase screens are not yet implemented.

Paper Details

Date Published: 16 July 2010
PDF: 13 pages
Proc. SPIE 7735, Ground-based and Airborne Instrumentation for Astronomy III, 77352T (16 July 2010); doi: 10.1117/12.856253
Show Author Affiliations
Natalia Yaitskova, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Kjetil Dohlen, Lab. d'Astrophysique de Marseille, CNRS, Univ. de Provence (France)
Patrick Rabou, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Anthony Boccaletti, Observatoire de Paris-Meudon (France)
Marcel Carbillet, Lab. Fizeau, CNRS, Univ. de Nice Sophia Antipolis (France)
Jean-Luc Beuzit, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Markus Kasper, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)
Norbert Hubin, European Organisation for Astronomical Research in the Southern Hemisphere (Germany)


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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