KCl对GeS_2-Ga_2S_3硫系玻璃光学性能的影响

Optic Effect of KCl on GeS_2G-Ga_2S_3 Chalcogenide Glasses

采用熔融淬冷法制备了GeS2-Ga2S3-KCl系统玻璃,然后测试了样品的厚度、密度、吸收光谱和透射光谱,利用经典的Tauc方程计算了样品光学带隙允许的直接跃迁。结果显示,GeS2-Ga2S3-KCl玻璃拥有较好的物理性能;样品的密度、折射率随着KCl含量增多而减小,而光学带隙则随着KCl含量增加而增大。此外,傅里叶和拉曼红外光谱仪的测试结果表明,随着KCl加入和含量的增加,玻璃基质网络结构发生变化,从而引起相应红外光学性能的改变;同时玻璃拉曼谱出现阶段性的变化,红外截止边带出现了规律性的红移。通过研究KCl含量对基质玻璃的结构影响,给出了硫卤玻璃中基频声子振动与红外多声子吸收截止特性的定量描述,归纳了该类硫卤玻璃的光学性质与基质的依赖关系。

Series of GeS2-Ga2S3-KCl chalcohalide glasses were prepared by traditional melt-quenching method.Thickness,density,refractive index,visible/near-infrared Absorption and infrared transmission spectra were adopted to the analysis of the allowed direct interband optical transitions of optic gap with Tauc equation.The results show a good physical performance as it possesses a wide glass-forming regions of GeS2-Ga2S3-KCl pseudo-ternary glass system.With the increasing of KCl content,there were significant decreases in glass density and refractive index,but there is a significant augmentation of optic band gap.Others,some corresponding changes of glass host structure were deduced from FTIR and Raman spectra,as that the IR optic spectra was improved,just like the Raman spectrum changed by steps,IR Absorption cutting-off edge red-shifted with regular.Based on the analysis of KCl adding in the glass host,a quantitative description was given about the correlations between IR multi-phonon Absorption and fundamental phonon-vibration,as it shows a deterministic dependence of the optic optical properties of chalco-halide glasses on glass host.