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通过理论与实验研究了光学厚度对Tm3+：YAG材料光谱烧孔孔深的影响。提出了一种用于分析光学厚度对光谱烧孔孔深影响的新模型。该模型从理论上推导了烧孔孔深与光学厚度的关系。根据提出的理论模型，当温度大于4K时，通过选择合适的光学厚度可以使光谱烧孔孔深得到最大值。最后通过使用合适的激光与Tm3+：YAG材料所形成的光谱烧孔实验证明了实验结果与理论分析是相一致的。“,”Spectral hole depth dependence on optical length in Tm3 + :YAG was theoretically and experimentally investigated. A novel model was proposed to analyze the spectral hole depth dependence on optical length. With the proposed model, the spectral hole depth dependence on optical length had been derived theoretically. According to the theoretic result, when temperature was higher than 4 K, the maximum spectral hole depth could be found by choosing the optimum optical length. The theoretical analysis were experimentally tested using spectral hole burning in Tm3+:YAG for a couple of configurations and sizes of the beams.