| Optimum fluorescence emission around 1.8 μm for LiYF4 single crystals of various Tm3＋-doping concentrations |
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| 作者姓名： | 李珊珊 夏海平 符立 董艳明 谷雪梅 章践立 王冬杰 张约品 江浩川 陈宝玖 |
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| 作者单位： | Key Laboratory of Photo-electronic Materials, Ningbo University;Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences;Department of Physics, Dalian Maritime University |
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| 基金项目： | Project supported by the National Natural Science Foundation of China(Grant Nos.51472125 and 51272109);the Natural Science Foundation of Ningbo City,China(Grant No.201401A6105016);K.C.Wong Magna Fund in Ningbo University,China(Grant No.NBUWC001) |
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| 摘 要： | In this paper, optical spectra of LiYF4 single crystals doped with Tm3＋ ions of various concentrations are reported. The emission intensity at 1.8 ktm first increases with increasing Tm3＋ concentration, and reaches a maximum value when the concentration of Tm3＋ is about 1.28 mol%, then it decreases rapidly as the concentration of Tm3＋ further increases to 3.49 mol%. The emission lifetime at 1.8 p.m also shows a similar tendency to the emission intensity. The maximum lifetime of 1.8 μm is measured to be 17.68 ms for the sample doped with Tm3＋ of 1.28 mol%. The emission cross section of 3F4 level is calculated. The maximum reaches 3.76 × 10 -21 cm2 at 1909 nm. The cross relaxation （3H6, 3H4 →3 F4, 3F4） between Tm3＋ ions and the concentration quenching effect are mainly attributed to the change of emission with Tm3＋ concentration. The largest quantum efficiency between Tm3＋ ions is estimated to be ,-147% from the measured lifetime and calculated radiative lifetime. All the results suggest that the Tm3＋/LiYF4 single crystal may have potential applications in 2 μm mid-infrared lasers.
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| 关 键 词： | 浓度增加 铥离子 荧光发射 单晶 中红外激光器 发光强度 发光寿命 使用寿命 |
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