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Proceedings Paper

Interferometry with singlemode waveguide
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Paper Abstract

Interferometry beam combiners that use optical waveguides, i.e. optical fibers or integrated optics, become popular in optical interferometry because of their flexibility, but also in the case of single-mode waveguide because of their properties of spatial filtering that increases the accuracy of interferometric measurement in an atmosphere-perturbed environment. However we know very little about the way the electric field propagates and even less about the correlation between the different beams of an optical interferometer. In this paper, we present in this paper an analysis of single mode optical waveguides in the framework of stellar interferometry. We first analyze the output electric field using radiated modes and show that the rejection rate we can derive in the case of nulling interferometry depends on many parameters, including the flux integration radius and the force of the aberrations. Secondly, since the interferometric equation can be interpreted in terms of carrying wave that carries respectively the optical power received by each telescope and the coherent power between two telescopes, we show that the interferometric equation involves a quantity called the modal visibilities which is not equal to the object visibility. The relationship between the two visibilities and the behaviour in the presence of atmosphere are also presented.

Paper Details

Date Published: 21 February 2003
PDF: 9 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.458917
Show Author Affiliations
Pierre Mege, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Fabien Malbet, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Alain Chelli, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)

Published in SPIE Proceedings Vol. 4838:
Interferometry for Optical Astronomy II
Wesley A. Traub, Editor(s)

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