Nd:YAG晶体发光的浓度和温度特性

Luminescence Dependence upon Concentration and Temperature in Nd:YAG Crystals

在 8K低温下测量了温梯法生长的不同浓度Nd :YAG晶体的高分辨吸收谱 ,Nd掺杂的摩尔分数分别为0 .0 1,0 .0 2和 0 .0 3,YAG在不同浓度下都存在明显的卫星线结构 .对不同浓度Nd :YAG晶体荧光光谱的研究发现 ,摩尔分数为 0 .0 2的Nd :YAG晶体具有最强的荧光强度 .从 6K到 30 0K的不同温度下对不同浓度Nd :YAG晶体的4F3 / 2 能级的荧光衰减进行了测量 .实验发现 ,不同浓度Nd :YAG的衰减曲线都表现出明显的非指数形式 .高浓度Nd :YAG晶体的荧光寿命呈现出明显的温度依赖特性 ,这主要归因于Nd3 + 离子间相互作用和能量转移速率随Nd浓度的增加而增大 .

The high resolution absorption spectra of Nd:YAG crystals grown by temperature gradient technique (TGT) are measured for Nd ion mole fractions of concentration in the range 0.01～0.03 at low temperature(8K). The satellitic lines of Nd:YAG crystals are observed besides the main line for different Nd dopant concentrations. The measurement of emission spectra for different Neodymium dopant concentration at low temperature suggest that the Nd:YAG crystals with 0.02 mole fraction of Nd ion concentration possess the highest fluorescence intensity. The emission decays of 4F_ 3/2 level of Nd 3+ in YAG by pumping into 4G_ 5/2 level are measured at temperatures 6K～300K for different Neodymium dopant concentrations. The nonexponential luminescence decays are observed for different Nd ion concentration of Nd:YAG. The dependence of fluorescence lifetime on temperature for highly doped Nd:YAG ascribes to the interactions between Nd ions and the rate of energy transfer increasing.