采用传统熔融淬冷法制备了4组高Bi2O3含量的Bi2O3-B2O3-Ga2O3玻璃样品。测试了样品的密度、折射率和透过光谱,并分析了它们和Ga2O3含量之间的关系,拟合了样品的线性折射率随波长的变化曲线。根据Z扫描实验原理,利用钛宝石飞秒激光器测量了800 nm波长下各个样品的三阶非线性折射率n2以及非线性吸收系数β。结果表明:随着Ga2O3含量的增加,样品的线性折射率n0和三阶非线性折射率n2也随之增加,线性折射率最大样品对应的n2和β分别为3.331×10-18 m2/W和0.695 cm／GW,表明该系列玻璃样品是一种优良的三阶非线性光学基质材料。

A series of glasses with high Bi2O3 content of Bi2O3-B2O3-Ga2O3 ternary system were chosen and prepared by the conventional melt quenching methods. The densities,linear refractive indexes n0 and transmittance spectra of samples,and their relation with Ga2O3 content were measured. The third-order nonlinear-index coefficient n2 and the nonlinear absorption coefficient β of glasses were investigated at 800 nm by Z-scan technique using Ti:sapphire femto-second laser pluses. The conclusions were as follows:The values of n0 and n2 in glasses increase with increasing the Ga2O3 content. The values of n2 and β at 800 nm in the sample which had the largest refractive index in all samples are equal to 3.331×10-18 m2/W and 0.695 cm／GW,respectively. All the results show that these glasses are potential materials in the application to third-order nonlinear optical field.