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Vitreous materials based on chalcogen elements (S, Se, Te) show large transparency windows that extend from the visible up to 12-15 μm in the infrared, depending on their compositions.1) This is due to the lower phonon energies of chalcogenides, which are also responsible for enhanced luminescence of rare-earth ions embedded in such matrices.2) In addition, chalcogenide glasses contain large polarizable atoms and external lone electron pairs which induce exceptional non-linear properties as compared to oxide glasses.