Microstructure and Optical Properties of the (1-x) GeS_2-xP_2S_5 Glasses

摘要

To find materials with larger second-order nonlinearity, the Ge-P-S chalcogenide glasses with various ratios of GeS_2 :P_2 S_5 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 .