Microstructure and optical properties of the (1−x) GeS₂−xP₂S₅ glasses

Abstract

To find materials with larger second-order nonlinearity, the Ge−P−S chalcogenide glasses with various ratios of GeS₂:P₂S₅ were prepared by the melt-quenching method. The microstructure and optical properties of these glasses were characterized by XRD, Raman, Vis-NIR spectroscopy and Maker fringe technique. The second harmonic generation (SHG) was observed in the as-prepared chalcogenide glasses which was ascribed to the thermal stress gradient and/or the microanisotropic defects (such as the lone-pair orbital or the valence alternative pairs) prefer-orientation of the as-prepared glasses.

Keywords

chalcogenide / nonlinearity / microcrystal / defects

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