IR GRIN lenses prepared by ionic exchange in chalcohalide glasses

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...

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Autores principales:	Claire Fourmentin, Xiang-Hua Zhang, Enora Lavanant, Thierry Pain, Mathieu Rozé, Yann Guimond, Francis Gouttefangeas, Laurent Calvez
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/1c315ce8ecb648f59fd8e91fabebc02b
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spelling	oai:doaj.org-article:1c315ce8ecb648f59fd8e91fabebc02b2021-12-02T15:49:45ZIR GRIN lenses prepared by ionic exchange in chalcohalide glasses10.1038/s41598-021-90626-42045-2322https://doaj.org/article/1c315ce8ecb648f59fd8e91fabebc02b2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-90626-4https://doaj.org/toc/2045-2322Abstract 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.Claire FourmentinXiang-Hua ZhangEnora LavanantThierry PainMathieu RozéYann GuimondFrancis GouttefangeasLaurent CalvezNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Claire Fourmentin Xiang-Hua Zhang Enora Lavanant Thierry Pain Mathieu Rozé Yann Guimond Francis Gouttefangeas Laurent Calvez IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
description	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.
format	article
author	Claire Fourmentin Xiang-Hua Zhang Enora Lavanant Thierry Pain Mathieu Rozé Yann Guimond Francis Gouttefangeas Laurent Calvez
author_facet	Claire Fourmentin Xiang-Hua Zhang Enora Lavanant Thierry Pain Mathieu Rozé Yann Guimond Francis Gouttefangeas Laurent Calvez
author_sort	Claire Fourmentin
title	IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
title_short	IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
title_full	IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
title_fullStr	IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
title_full_unstemmed	IR GRIN lenses prepared by ionic exchange in chalcohalide glasses
title_sort	ir grin lenses prepared by ionic exchange in chalcohalide glasses
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/1c315ce8ecb648f59fd8e91fabebc02b
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IR GRIN lenses prepared by ionic exchange in chalcohalide glasses

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