采用Czochralski法生长了均匀透明的ErCa4O(BO3)3(简称ECOB)晶体,测量了其室温吸收谱,并与0.1 mol的ErCl3溶液的室温吸收谱进行了比较.根据Judd-Ofelt理论,拟合出唯像强度参数:Ω2=1.673×10-20 cm2,Ω4=1.356×10-20 cm2,Ω6=0.156×10-20 cm2.计算了各能级的辐射跃迁几率AJ,J′,振子强度fJ,J′,辐射寿命τ,荧光分支比βJ′等,并根据这些光学参量,讨论了该晶体的部分性能和应用前景.

The transparent and homogeneous ErCa 4O(BO 3) 3 (ECOB) crystal is grown by Czochralski method. The room temperature absorption spectra have been measured and compared with that of 0.1 mol ErCl 3 solution. According to Judd-Ofelt theory, the spectral strength parameters: Ω 2=1.673×10 -20 cm 2, Ω 4=1.356×10 -20 cm 2, Ω 6=0.156×10 -20 cm 2 of Er 3+ ion have been fitted. The radiative transition probabilities A J,J′, oscillator strengths f J,J′, radiative lifetime τ and the branching ratio β J′ have been calculated. From these parameters, the properties and applications were discussed.