【摘要】 用电子能量色散谱（ＥＤＳ）分析了Ｎｄ（３＋），Ｅｒ（３＋）和Ｃｒ（３＋）等掺杂离子在ＹＡＧ单晶光纤中的分布，实验发现：掺杂离子的分凝系数不同，其分布规律也不同．根据晶体的熔液生长理论，导出了掺杂离子分布方程，它与实验结果相符较好．更多还原

【Abstract】 Single crystal fibers (SCF) have the intrinsic attributes of both crystal and fiber. The properties of SCF, like that of bulk crystal, can be affected by the dopants distribution to a great extent. In this work the sampe of single crystal fibers, Nd3+: YAG (Ke<1), Er3+: YAG (Ke = 1) and Cr3+: YAG (Ke>1),are grown by the Laser Heated Pedestal Growth (LHPG) method. Electronic Dispersion Spectra (EDS) is used to analyse the dopants concentration. It’s found that the profiles of dopant distribution are determined by the effective distribution coefficients of the dopants.Equation describing the dopants distribution are derived from the theory of meltcrystal growth, and it may be written in the follow form:Cs(z)=C0[3β/(β+2)][1+(Ke-1)exp(-z /σ)]·[1-(1-1 /β)(2r2-r4)] it’s obvious that the dopant distribution in the LHPG-grown SCF is affected by the effective distribution coefficient of the dopant. The axial average concentration does not change after a certain length of the fiber no matter what Ke is. The radial distribution like that shown in Fig.3, when Ke>1 , the concentration in the centre is higher than that at the border; when Ke<1, the conentration in the centre is lower than that at the border; and when Ke = 1, the dopant is well distributed.更多还原