贾德奥菲尔特(Judd-Ofelt,J-O)理论是半定量地研究稀土离子掺杂基质中4f能级间跃迁光学性质的经典理论,但标准的贾德奥菲尔特理论表达式本身含有一定的简化近似和假设,应用于Pr3+等具有特殊能级的稀土离子时会产生异常结果。制备了掺Pr3+和Tm3+的氟化镓铟玻璃,研究了玻璃的吸收光谱。应用标准的和改进后的贾德奥菲尔特理论分别拟合得到了不同的贾德奥菲尔特强度参量和跃迁振子强度。通过分析对比可知,“超敏感跃迁”是产生异常贾德奥菲尔特理论计算的重要因素;当加入了“超敏感跃迁”所对应奇数项约化矩阵元后,运用改进的贾德奥菲尔特理论可计算出氟化镓铟玻璃中Pr3+较合理的贾德奥菲尔特强度参量,并可对Tm3+的振子强度参量进行更好的拟合。

Judd-Ofelt (J-O)theory is the classical theory which is used to semiquantitative study 4f energy levels transitions’s spectroscopic properties of rare-earth ions doped materials. Because many approximations and assumptions were involved in standard J-O theory, there are some exceptional behaviors when it is used for special earth ions such as Pr3+. Pr3+-, Tm3+-doped fluorogallate glasses were fabricated and the absorption spectrum of these glasses were studied. According to standard and modified Judd-Oflet theories, the different J-O intensity parameters Ωλ and oscillator strengths of those glasses have been calculated. The results show the “hypersensitive transitions” play the important role in exceptional behaviors of J-O theory calculation. When the corresponding odd reduced matrix element of “hypersensitive transitions” is added, the Ωλ of Pr3+ in fluorogallate glass obtained from modified J-O theory are more reliable than other approaches; for the experimental oscillator strengths of Tm3+, there is also a better fit by the modified J-O theory than other calculated ones.