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采用单离子晶场跃迁模型，拟合出钇铁石榴石（ＹＩＧ）薄膜材料的光吸收谱，与实验谱吻合得较好。从实验和理论上分析了（ＢＩＡＩ）ＹＩＧ 薄膜材料的光吸收谱，结果表明，Ａｌ３＋离子的作用如同稀释剂一样，减小了光吸收，Ｂｉ３＋离子由于其强的自旋轨道耦合作用，增大了跃迁振子强度和跃迁线宽，从而增大了光吸收损耗，在此基础上所作的（ＢｉＡｌ）ＹＩＧ的理论谱与实验谱符合得较好。
The light absorption spectra of yttrium iron garnet (YIG) thin films were fitted by the single ion crystal field transition model, which was in good agreement with the experimental data. The optical absorption spectra of (BIAI) YIG thin films have been analyzed experimentally and theoretically. The results show that Al3 + ions act as diluents to reduce the light absorption and Bi3 + ions increase due to their strong spin-orbit coupling The intensity of the transitional oscillator and the line width of the transition are increased, thereby increasing the light absorption loss. On this basis, the theoretical spectrum of (BiAl) YIG is in good agreement with the experimental spectrum.