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掺Yb氟化物激光材料是继掺Yb氧化物激光材料之后的另一类重要的掺Yb激光材料,已经成为可调谐激光和超快激光领域中研究的热点之一。针对两种国产新型掺Yb的氟化物激光材料:混晶材料Yb∶CaF2-SrF2和共掺离子型的单晶材料Yb,Y∶CaF2,进行了详细的光谱特性比对实验研究。通过荧光比对实验,发现这两类激光材料的荧光光谱完全不同,并分析了不同荧光产生的物理机制。通过吸收率比对实验,讨论了两类材料中的激活离子Yb或共掺离子Y的掺杂浓度对晶体吸收特性的影响,得到了最佳掺Yb离子或共掺Y离子的浓度。利用激光二极管作为泵浦源,实现了这两类新型材料在折叠腔型下的连续激光输出运转,其中对于共掺离子型Yb,Y∶CaF2晶体是首次实现连续激光运转。通过激光对比实验,获得了两类激光材料(四种样品)的激光输入—输出关系曲线,测量了各自的斜效率和激光光谱特征。通过系统地比较两类激光晶体的吸收率、荧光光谱特性、激光光谱特性以及连续激光运转的阈值功率和斜效率等参数得出以下结论:在四种实验样品中,共掺离子型单晶材料中的3at%Yb,6at%Y∶CaF2晶体具有最好的光谱和激光特性,具有良好的应用前景。这些实验结果为进一步提升此类激光材料的性能提供了有益的参考。
Yb Fluoride-doped laser material is another important Yb-doped laser material after Yb oxide laser material. It has become one of the hot topics in the fields of tunable laser and ultra-fast laser. In this paper, two kinds of novel Yb-doped fluoride laser materials: Yb: CaF2-SrF2 mixed materials and Yb, Y:CaF2 co-doped single crystal materials were studied. Fluorescence comparison experiments show that the fluorescence spectra of these two types of laser materials are completely different and the physical mechanism of different fluorescence generation is analyzed. By comparing the absorption rate experiment, the influence of the doping concentration of activated ion Yb or co-doping Y on the absorption properties of the two materials is discussed, and the optimum concentrations of Yb ions or co-doping Y ions are obtained. Using laser diodes as the pump source, the continuous laser output operation of these two new types of materials under the folded cavity is realized. For the co-doped Yb and Y: CaF2 crystals, continuous laser operation is achieved for the first time. The laser input - output curves of two types of laser materials (four samples) were obtained by laser contrast experiment, and their respective slant efficiency and laser spectral characteristics were measured. By systematically comparing the absorption, fluorescence and laser spectral characteristics of two kinds of laser crystals and the threshold power and slope efficiency of continuous laser, the following conclusions can be drawn: In the four experimental samples, co-doped single crystal material In the 3at% Yb, 6at% Y: CaF2 crystals with the best spectral and laser properties, has a good prospect. These experimental results provide a useful reference for further enhancing the performance of such laser materials.