采用熔融一淬冷法制备了摩尔组成为(100-x)(0.85GeS_2-0.15Ga_2S_3)-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.
A series of (100-x) (0.85CeS_2-0.15Ga_2S_3) -xAgCl(x = 0,5 , 10, 15 ,20) glasses were prepared by conventional melt-quenching technique. The physical and optical properties, including densities, refrac-tive indices, transition temperatures, crystallization temperatures, absorption spectra and transmission spec-tra, 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 GeS_2-Ga_2S_3-AgCl glasses have a wide range of transnussion 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 in-crease, molar refraction, while metallization criterion and Urbach energy decrease. The effects of metalliza-tion criterion, optical band gap and Urbach energy on refractive indices of glass samples are also discussed.
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