Yang Xiao-Dong, Chen Ying, Chen Xiao-Bo, Sawarobori N, Wang Shui-Feng, Zhou Yong-Fen, Li Song, Xu Yi-Zhuang, Cheng Huan-Li, Yang Guo-Jian
Applied Optics Beijing Area Major Laboratory, Department of Physics, Analytical and Testing Center, Beijing Normal University, Beijing 100875, China.
Guang Pu Xue Yu Guang Pu Fen Xi. 2013 Jul;33(7):1734-8.
In the present paper, the absorption spectra of Ho3+ (0.5 mol%)-doped oxyfluoride glass (FOG) sample and Ho3+ (0.5 mol%)-doped oxyfluoride vitroceramics (FOV) sample were measured through experiment. The authors calculated the intensity parameters omega 2, 4, 6 of the two materials according to J-O theory, and analyzed the possible reason for the difference between the two materials on the intensity parameters. After that the authors calculated oscillator strength, spontaneous radiative transition rate, branching ratio and integrated emission cross section and some other spectroscopic parameters of several excited states and then made a comparative analysis of the two materials based on these spectroscopic parameters. The authors found that the oscillator strength of trivalent holmium iron in FOV is about the same with the oscillator strength in YAlO3 and is similar to oscillator strength in FOG, while slightly larger than in that LBTAF and much larger than that in LaF3 and ZBLAN. By analyzing the calculated spectroscopic parameters, it can be found that some transitions, especially 5I7 --> 5I8, 5F5 --> 5I8 etc., have a relatively large oscillator strengths(larger than 10(-6)) and large integrated emission cross sections(larger than 10(-18) cm). These transitions have the conditions to form laser passages, so they are worth a lot of attention. At last, application prospects of several strong luminescence transitions were concluded.
在本文中，通过实验测量了掺Ho³⁺（0.5 mol%）的氟氧化物玻璃（FOG）样品和掺Ho³⁺（0.5 mol%）的氟氧化物微晶玻璃（FOV）样品的吸收光谱。作者根据J-O理论计算了这两种材料的强度参数ω₂、ω₄、ω₆，并分析了两种材料在强度参数上存在差异的可能原因。之后，作者计算了几种激发态的振子强度、自发辐射跃迁速率、分支比和积分发射截面等光谱参数，并基于这些光谱参数对两种材料进行了对比分析。作者发现，FOV中三价钬离子的振子强度与YAlO₃中的振子强度大致相同，与FOG中的振子强度相似，而略大于LBTAF中的振子强度，远大于LaF₃和ZBLAN中的振子强度。通过分析计算得到的光谱参数，可以发现一些跃迁，特别是⁵I₇→⁵I₈、⁵F₅→⁵I₈等，具有相对较大的振子强度（大于10⁻⁶）和较大的积分发射截面（大于10⁻¹⁸ cm）。这些跃迁具备形成激光通道的条件，因此值得高度关注。最后，总结了几种强发光跃迁的应用前景。
