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Proceedings Paper

Singlemode planar optics for thermal infrared wavelengths astronomical interferometry
Author(s): Emmanuel Laurent; Pierre Y. Kern; Isabelle Schanen; V. Balan; C. Vigreux; Annie Pradel; S. Setzu; P. Ferrand; Robert Romestain; Karine Rousselet-Perraut; Pierre Benech
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Paper Abstract

Spatial filtering is a critical issue to achieve nulling interferometry in the framework of spatial missions aimed at the detection of exoplanets. Several working interferometric instruments take benefit of guided optics for spatial filtering in the near infrared wavelengths and thus provide accurate visibility measurements. Furthermore planar optics would also provide beam combining functions within a single compact and stable device. Existing telecom technology allows beam combiner manufacturing for 0.8-1.8 micrometers wavelengths. Adaptation of these technologies is required to cover the scientific domain of ground based interferometry in each atmospheric spectral band and of the spatial missions like IRSI/DARWIN and TPF dedicated to thermal infrared wavelengths [4-20 micrometers]. We present here some of the most promising materials and their associated technologies for the thermal infrared range. For each of these solutions, based on chalcogenide glasses, semiconductor materials and hollow waveguides, we present some manufactured components with their optical characterizations. We also present a method and test-benches to measure the single-mode wavelength range of waveguides.

Paper Details

Date Published: 21 February 2003
PDF: 8 pages
Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); doi: 10.1117/12.459742
Show Author Affiliations
Emmanuel Laurent, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Institut de Microelectronique, Electromagnetisme et Photonique (France)
Alcatel Space Industries (France)
Pierre Y. Kern, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Isabelle Schanen, Institut de Microelectronique, Electromagnetisme et Photonique (France)
V. Balan, Lab. de Physicochimie de la Matiere Condensee (France)
C. Vigreux, Lab. de Physicochimie de la Matiere Condensee (France)
Annie Pradel, Lab. de Physicochimie de la Matiere Condensee (France)
S. Setzu, Lab. de Spectrometrie Physique (France)
P. Ferrand, Lab. de Spectrometrie Physique (France)
Robert Romestain, Lab. de Spectrometrie Physique (France)
Karine Rousselet-Perraut, Lab. d'Astrophysique de l'Observatoire de Grenoble (France)
Pierre Benech, Institut de Microelectronique, Electromagnetisme et Photonique (France)


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

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