Calculating Hamiltonian parameters for Yb~(3+) in a low-symmetry lattice site,and fitting the structure and levels of Yb~(3+) :TaO_4 (= Gd,Y,and Sc)

An iterative method is used to find the values of the Hamiltonian parameters for Yb3+ in a given low-symmetry crystalline site.Samples of Yb3+:RETaO4(RE = Gd,Y,and Sc) were prepared and their structures were determined.Based on the obtained structural data,their orbital-spin parameters and crystal field parameters were fitted by the superposition model(SM).Using the crystal field parameters obtained by the SM fitting as the initial parameters,the Hamiltonian parameters were fitted iteratively.The calculated and experimental energy levels for Yb3+:RETaO4 are consistent,and the maximal mean-root-square deviation is only 2.84 cm-1,indicating that the method is effective to determine the Hamiltonian parameters of Yb3+ in low-symmetry crystalline sites.     

Calculating Hamiltonian parameters for Yb^3＋ in a low-symmetry lattice site, and fitting the structure and levels of Yb^3＋ ：RETaO4 （RE = Gd, Y, and Sc）

An iterative method is used to find the values of the Hamiltonian parameters for Yb^3＋ in a given low-symmetry crys- talline site. Samples of Yb^3＋ ：RETaO4 （RE = Gd, Y, and Sc） were prepared and their structures were determined. Based on the obtained structural data, their orbital-spin parameters and crystal field parameters were fitted by the superposition model （SM）. Using the crystal field parameters obtained by the SM fitting as the initial parameters, the Hamiltonian parameters were fitted iteratively. The calculated and experimental energy levels for Yb^3＋：RETaO4 are consistent, and the maximal mean-root-square deviation is only 2.84 cm^- 1, indicating that the method is effective to determine the Hamiltonian parameters of Yb^3＋ in low-symmetry crystalline sites.     

2.7μm激光晶体Yb,Er,Ho∶GSGG的生长与光谱性能研究

用提拉法成功生长出了Yb,Er,Ho∶ GSGG晶体,对其光谱性能进行了研究.测量了晶体在320～3000 nm波段内的吸收光谱.用970 nm激光激发,测量了晶体的稳态和瞬态荧光光谱,拟合得到2.7～3 μm激光上下能级寿命,用F-L公式计算了晶体的发射截面.与Er∶ GSGG和Yb,Er∶ GSGG晶体的光谱参数进行了比较,结果表明,Yb,Er,Ho∶GSGG是一种更适合LD泵浦,实现低阈值、高效率2.79 μm激光输出的新型激光晶体.     

高浓度Er~(3+)掺杂Y_3Sc_2Ga_3O_(12)晶体的吸收光谱与晶体场模型研究

采用提拉法生长出了高浓度掺铒(35 at%)钇钪镓石榴石(Er:YSGG)激光晶体.测试了该晶体在340—1700 nm波段内的吸收光谱,对其中Er3+的实验能级进行了分析指认.用Er:YSGG的102个实验Stark能级,拟合了它的自由离子参数和晶体场参数,均方根误差(拟合精度)σ为10.34 cm-1.结果表明,参数化Stark能级的拟合结果与实验光谱符合得较好.将拟合得到的Er:YSGG实验结果与文献中已报道Er:YAG的自由离子参数和晶体场参数进行了比较.指出Er:YSGG具有较强的晶体场相互作用或许是其激光效率较高的主要原因之一.