中文摘要：

将成玻性良好的Se逐步掺入到远红外Ge-As-Te玻璃中,观察其物理、光学特性的渐变过程.采用传统熔融淬冷法制备Ge_（10）As_（40）Te_（50-x）Se_x（x=0,10,20,30,40,50）系列玻璃,用X射线衍射仪、Raman光谱仪、热膨胀仪测试玻璃的内部微观结构和物化性质;用傅里叶红外光谱仪、分光光度计测试玻璃的可见/近红外与红外透射光谱等频谱性质;利用经典Tauc方程估算玻璃样品的直接和间接带隙.测试结果表明：Se含量的增加能有效提高玻璃的热稳定性,最高玻璃转化温度可达到233℃;可见/近红外短波截止边发生蓝移,光学带隙增大,透过范围广且透过性良好,红外透过率最高可达到56%,红外截止边仍然保持在20μm,当Se含量配比在低于2 mol的情况下,其热稳定性改善明显但光谱变化最小.最后,讨论了一种加还原剂Mg对该类玻璃进行提纯的方案,实验表明提纯后玻璃的透过谱线均匀平滑且无明显杂质峰.

英文摘要：

Se with good glass formation ability was gradually doped into the Ge-As-Te glasses,and then the gradual change processes of some key physical and optical properties were observed.A series of Ge_（10）As_（40）Te_（50-x）Se_x（x= 0,10,20,30,40,50） chalcogenide glass samples were prepared by the traditional melt-quenching method.The internal microstructure,physical and chemical properties of the glass samples were analyzed by using X-ray diffraction,Raman spectroscopy and thermal dilatometer instruments.Vis-NIR absorption spectra and infrared optical transmission spectra of these glasses were recorded with Spectrophotometer and Fourier transform infrared spectroscopy instrument.Then,the Tauc equation was adopted to calculate the direct and indirect optical band gaps of the glass samples.The results show that with the increasing of the Se,the thermal stability can be effectively improved,the maximum T_g can reach up to 233℃.A obvious blue shift of short infrared absorption spectrum cut-off edge appearance is observed in these glasses,i.e.The optical band gap increases gradually,which shows a wider range of transmission and better transparency spectrum,the maximum transmission rate can reach up to 56%.Infrared cut-off edge remains at 20μm,while Se content is less than 2 mol,its thermal stability is improved obviously and the optical spectral changes little.At last,using metal Mg as an oxide redactor for the purification of these glasses,the results show that the transmission spectra is much smooth and without any obvious impurity absorption peaks after the appropriate purification process.