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1. Chalcogenide glass
1.1 Glassy state
A glass is a structurally amorphous solid obtained by rapidly cooling the mixture above the melting temperature. To form a glass, a polymerization process is triggered and controlled in the molten bath, increasing the viscosity of the liquid by establishing bonds that propagate over long distances. On cooling, the atoms that have remained tightly bound in the viscous liquid must not have time to diffuse to reach the most thermodynamically stable crystallized state. The glassy solid is therefore in a metastable state that has retained the structural organization of the viscous liquid. Although amorphous, glass is not completely disordered. Its structural framework is built from polyhedra specific to each family, maintaining a strong local structural order.
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Chalcogenide glass
Chalcogenide optical fibers
Bibliography
Websites
The French glass portal http://www.verreonline.fr/v_plat/prop_trans1.php
Patents
Chalcogenide based cheap vitreous composition and production process FR1060133
Process for obtaining a glassy material optically transparent in the infrared, and optical device comprising such a material WO2012076527
Evanescent infrared wave sensors and method of manufacture PCT/EP 055038
Chemical species optical sensor operating in infrared WO2011042628...
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
Production of chalcogenide glass, Umicore IR-Glass http://www.umicore.fr/NosActivites/Documents/Acigne.htm
Fluoride glass and fiber production, Le Verre Fluoré http://leverrefluore.com/
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