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Proceedings Paper

Integrated optics for nulling interferometry in the thermal infrared
Author(s): Marc Barillot; Eleonore Barthelemy; Jean-Emmanuel Broquin; Jérôme Frayret; Jérôme Grelin; Gary Hawkins; Volker Kirschner; Gilles Parent; Annie Pradel; Emmanuel Rossi; Caroline Vigreux; Shaoqian Zhang; Xianghua Zhang
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Paper Abstract

Modal filtering is based on the capability of single-mode waveguides to transmit only one complex amplitude function to eliminate virtually any perturbation of the interfering wavefronts, thus making very high rejection ratios possible in a nulling interferometer. In the present paper we focus on the progress of Integrated Optics in the thermal infrared [6-20μm] range, one of the two candidate technologies for the fabrication of Modal Filters, together with fiber optics. In conclusion of the European Space Agency's (ESA) "Integrated Optics for Darwin" activity, etched layers of chalcogenide material deposited on chalcogenide glass substrates was selected among four candidates as the technology with the best potential to simultaneously meet the filtering efficiency, absolute and spectral transmission, and beam coupling requirements. ESA's new "Integrated Optics" activity started at mid-2007 with the purpose of improving the technology until compliant prototypes can be manufactured and validated, expectedly by the end of 2009. The present paper aims at introducing the project and the components requirements and functions. The selected materials and preliminary designs, as well as the experimental validation logic and test benches are presented. More details are provided on the progress of the main technology: vacuum deposition in the co-evaporation mode and subsequent etching of chalcogenide layers. In addition, preliminary investigations of an alternative technology based on burying a chalcogenide optical fiber core into a chalcogenide substrate are presented. Specific developments of anti-reflective solutions designed for the mitigation of Fresnel losses at the input and output surface of the components are also introduced.

Paper Details

Date Published: 28 July 2008
PDF: 12 pages
Proc. SPIE 7013, Optical and Infrared Interferometry, 701314 (28 July 2008); doi: 10.1117/12.789378
Show Author Affiliations
Marc Barillot, Thales Alenia Space (France)
Eleonore Barthelemy, Institut Charles Gerhardt (France)
Jean-Emmanuel Broquin, Institut de Microélectronique, Electromagnétisme et Photonique, Minatec, INPG (France)
Jérôme Frayret, Institut Charles Gerhardt (France)
Jérôme Grelin, Institut de Microélectronique, Electromagnétisme et Photonique, Minatec, INPG (France)
Gary Hawkins, Univ. of Reading (United Kingdom)
Volker Kirschner, European Space Agency (Netherlands)
Gilles Parent, Lab. d'Energétique et de Mécanique Théorique et Appliquée (France)
Annie Pradel, Institut Charles Gerhardt (France)
Emmanuel Rossi, Thales Alenia Space (France)
Caroline Vigreux, Institut Charles Gerhardt (France)
Shaoqian Zhang, Univ. de Rennes I (France)
Xianghua Zhang, Univ. de Rennes I (France)

Published in SPIE Proceedings Vol. 7013:
Optical and Infrared Interferometry
Markus Schöller; William C. Danchi; Françoise Delplancke, Editor(s)

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