GeS2-Ga2S3-AgCl玻璃的光学特性研究
Study of Optical Properties of GeS2-Ga2S3-AgCl Glasses
Received date: 2009-05-25
Revised date: 2009-09-02
Online published: 2010-02-20
采用熔融淬冷法制备了摩尔组成为（100-x）(0.85GeS2-0.15Ga2S3)-xAgCl（x=0,5,10,15,20）硫卤玻璃, 测试了样品的密度、转变温度、析晶温度、可见到中远红外透过光谱、吸收光谱以及折射率参数, 根据Z扫描测试原理用钛宝石飞秒激光器测试了样品的三阶非线性特性. 利用经典的Tauc方程计算了样品光学带隙允许的直接跃迁、允许的间接跃迁及Urbach能量.讨论了玻璃的摩尔折射度、金属标准值、光学带隙、Urbach能量对玻璃样品折射率的影响.结果表明：该系统玻璃具有较宽光谱, 从可见到中远红外透过区域（0.46~11.50)μm,可作为潜在的多光谱成像材料.随AgCl含量的增加, 玻璃的折射率随着摩尔折射度增大而增大, 金属标准值、光学带隙与Urbach能量有减小的趋势, 而玻璃的三阶非线性性能得到明显提高.
范鑫烨 , 徐铁峰 , 沈 祥 , 戴世勋 , 聂秋华 , 王训四 , 陈飞飞 . GeS2-Ga2S3-AgCl玻璃的光学特性研究[J]. 无机材料学报, 2010 , 15(2) : 191 -195 . DOI: 10.3724/SP.J.1077.2010.00191
A series of （100-x）(0.85GeS2-0.15Ga2S3)-xAgCl（x=0,5,10,15,20）glasses were prepared by conventional melt-quenching technique. The physical and optical properties, including densities, refractive indices, transition temperatures, crystallization temperatures, absorption spectra and transmission spectra, were determined. The allowed direct transition, indirect transition and Urbach energy of samples were calculated according to the classical Tauc equation. Z-scan technique was carried out to investigate the third-order nonlinear optical properties of the samples. The results show that these GeS2-Ga2S3-AgCl glasses have a wide range of transmission approximately from 0.46μm to 11.5μm, and high refractive indices which are more than 2.2. With the AgCl content increasing, the refractive indices and the third-order nonlinearity increase, molar refraction, while metallization criterion and Urbach energy decrease. The effects of metallization criterion, optical band gap and Urbach energy on refractive indices of glass samples are also discussed.
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