Structure and Nonlinear Refractive Index of Bismuth Borate Glass

The method of conventional glass melting is used to study the glass formation region of Bi_2O_3-B_2O_3-TiO_2-La_2O_3 system.The instrument of Differential Scanning Calorimeter (DSC) is used to research the glass stability.Raman spectra and IR spectra are used to speculate on the structure of glasses.The refractive index of glass is measured by prism coupler.With increase of Bi_2O_3,the glass stability,the amount of [BiO_5] group and boron-oxygen loops decrease,while the content of B-O- bond,refractive index and nonlinear refractive index increase.