Search

Your search keyword '"Claire Fourmentin"' showing total 3 results
Start Over Author "Claire Fourmentin"
3 results on '"Claire Fourmentin"'

1. IR GRIN lenses prepared by ionic exchange in chalcohalide glasses

Author

Claire Fourmentin, Xiang-Hua Zhang, Enora Lavanant, Thierry Pain, Mathieu Rozé, Yann Guimond, Francis Gouttefangeas, and Laurent Calvez

Subjects
Medicine, Science
Abstract

Abstract In order to decrease the number of lenses and the weight of thermal imaging devices, specific optical design are required by using gradient refractive index (GRIN) elements transparent in the infrared waveband. While widely used for making visible GRIN lenses with silicate glasses, the ion exchange process is very limited when applied to chalcogenide glasses due to their low Tg and relatively weak mechanical properties. In this paper, we develop chalco-halide glasses based on alkali halide (NaI) addition in a highly covalent GeSe2–Ga2Se3 matrix, efficient for tailoring a significant and permanent change of refractive by ion exchange process between K+ and Na+. Optical and structural properties of the glass samples were measured showing a diffusion length reaching more than 2 mm and a Gaussian gradient of refractive index Δn of 4.5.10–2. The obtained GRIN lenses maintain an excellent transmission in the second (3–5 µm) and third (8–12 µm) atmospheric windows.

Published
2021
Full Text
View/download PDF

2. IR GRIN lenses prepared by ionic exchange in chalcohalide glasses

Author

Xianghua Zhang, Mathieu Rozé, Thierry Pain, Enora Lavanant, Laurent Calvez, Francis Gouttefangeas, Yann Guimond, Claire Fourmentin, Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Umicore IR Glass, Synthèse Caractérisation Analyse de la Matière (ScanMAT), Centre National de la Recherche Scientifique (CNRS)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Institut de Chimie du CNRS (INC), The authors are grateful to the French DGA, Direction Générale de l’Armement (project ANR-18-ASTR-0014) for supporting this work. Authors would like to acknowledge the IUF (Institut Universitaire de France). This publication is supported by the European Union through the European Regional Development Fund (ERDF), the Ministry of Higher Education and Research, the french region of Brittany and Rennes Métropole., ANR-18-ASTR-0014,IRGRIN,Optiques InfraRouges moulable à GRadient d'INdice de réfraction à base de verres de chalcogénures(2018), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Université de Rennes (UR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Materials for devices, Materials science, Infrared, Chalcogenide, Science, Diffusion, Analytical chemistry, Halide, Ionic bonding, 02 engineering and technology, 01 natural sciences, Article, 010309 optics, chemistry.chemical_compound, 0103 physical sciences, [CHIM]Chemical Sciences, Multidisciplinary, Ion exchange, Glasses, 021001 nanoscience & nanotechnology, Alkali metal, chemistry, Medicine, 0210 nano-technology, Refractive index, Materials for optics
Abstract

In order to decrease the number of lenses and the weight of thermal imaging devices, specific optical design are required by using gradient refractive index (GRIN) elements transparent in the infrared waveband. While widely used for making visible GRIN lenses with silicate glasses, the ion exchange process is very limited when applied to chalcogenide glasses due to their low Tg and relatively weak mechanical properties. In this paper, we develop chalco-halide glasses based on alkali halide (NaI) addition in a highly covalent GeSe2–Ga2Se3 matrix, efficient for tailoring a significant and permanent change of refractive by ion exchange process between K+ and Na+. Optical and structural properties of the glass samples were measured showing a diffusion length reaching more than 2 mm and a Gaussian gradient of refractive index Δn of 4.5.10–2. The obtained GRIN lenses maintain an excellent transmission in the second (3–5 µm) and third (8–12 µm) atmospheric windows.

Published
2021
Full Text
View/download PDF

3. Chalcogenide fibers for infrared sensing

Author

Catherine Boussard-Plédel, Bruno Bureau, Claire Fourmentin, David Le Coq, and Shuo Cui

Subjects
chemistry.chemical_compound, Thesaurus (information retrieval), Information retrieval, chemistry, Chalcogenide, Infrared, Computer science
Published
2019
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results