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21 February 2003 Singlemode planar optics for thermal infrared wavelengths astronomical interferometry
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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.
© (2003) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Emmanuel Laurent, Pierre Y. Kern, Isabelle Schanen, V. Balan, C. Vigreux, Annie Pradel, S. Setzu, P. Ferrand, Robert Romestain, Karine Rousselet-Perraut, and Pierre Benech "Singlemode planar optics for thermal infrared wavelengths astronomical interferometry", Proc. SPIE 4838, Interferometry for Optical Astronomy II, (21 February 2003); https://doi.org/10.1117/12.459742
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