Spatially resolved correlation between glass structure and refractive index modifications resulting from irradiation of chalcogenide glass by femtosecond pulse train
1 Lab. Physico-Chimie de l’Atmosphère, Université du Littoral Côte d’Opale 189A Av Maurice Schumann, 59140 Dunkerque France
2 Institut des Sciences Chimiques de Rennes – Unité Verres et Céramiques CNRS UMR 6226 Campus de Beaulieu – Bat 10B – 35042 Rennes Cedex, France
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A detailed analysis of 2D μ-Raman mapping of refractive index variation (Δn) induced by femtosecond filament in the bulk of a ternary (Ge-Ga-S) chalcogenide glass is presented. The results demonstrate strong structural modifications. S3Ga-GaS3 ethane like units are transformed into triclusters of Ga/S. Also the decrease of the population of GeS4/2 tetrahedrons implies the formation of mixed triclusters T/S where T=Ga and/or Ge. Finally, the refractive index variation is correlated to the structural modifications.
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