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.
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