掺镱TeO_2-Al_2O_3-Cs_2O玻璃的光谱性质

Spectroscopic Properties of Ytterbium-doped TeO_2-Al_2O_3-Cs_2O Glass

采用熔融法制备了一种组分为80TeO2-10Al2O3-10Cs2O-xYb2O3(x=0～1.6)(mol%)的掺镱碲酸盐玻璃材料,测试了该玻璃材料的密度、热膨胀系数和折射率随波长的变化关系,分析了其吸收光谱、荧光光谱和荧光寿命随Yb3+浓度的变化性质.利用McCumber理论计算了该玻璃系统中Yb3+离子从2F5/2到2F7/2能级跃迁的受激发射截面.实验表明:当Yb2O3掺杂量为1mol%时,Yb3+在1 004nm波长处的发射截面为1.06×10-20 cm2,荧光有效线宽为89.6nm,荧光寿命达到最大值为0.80ms.激光性能评价结果表明,该掺镱碲酸盐玻璃是实现超短脉冲激光的候选材料之一.

A kind of Yb3＋-doped tellurite glass with the composition of 80TeO2-10Al2 O3-10Cs2O- xYb2O3 （x = 0 -1. 6）（mol%） was prepared by conventional melt-quenching method. The dependence of the density, thermal expansion coefficient and refractive index of the glass with wavelength were measured. The absorption spectra, fluorescence spectra and fluorescence lifetimes of samples doped with different concentrations of Yb3＋ ions were studied. The stimulated emission cross-sections （σemi） Of Yb3＋ ions from 2F5/2 level to 2F7/2 level in the samples were calculated with the McCumber theory. The results indicate that the emission cross-section of the glass for the Yb2O3 doping level of 1 mol% is 1. 06 × 10^-20 cm2 at 1 004 nm, its fluorescence effective bandwidth is about 89. 6 nm, and the fluorescence lifetime reaches the maximum of 0.80 ms. The laser performance assessment results show that the glass is a potential candidate for ultra-short pulse lasers.