通过实验研究了不同切割方向Co ²⁺∶MgAl₂O₄的可饱和吸收特性。测量了[100]和[110]切割方向Co ²⁺∶MgAl₂O₄的各向异性透过率特性,测量结果表明,[100]和[110]切割晶体的透过率随入射光偏振方向呈周期性变化。采用[100]和[110]两种切割方向Co ²⁺∶MgAl₂O₄分别构成被动调Q激光器,并比较激光器的输出特性,结果表明,采用[110]切割的晶体有明显的优势,相比[100]切割晶体输出能量提高约8%,稳定性、光束质量、消光比均略有提高。

The saturable absorption characteristics of Co ²⁺∶MgAl₂O₄ crystals in different cutting directions were experimentally studied. The anisotropic transmittance characteristics of [100] and [110]-cut Co ²⁺∶MgAl₂O₄ crystals were measured, and the measurement results showed that the crystal transmittance of [100] and [110] cutting directions changed periodically depend on the polarization direction of the incidence light. And, the output characteristics of two cutting directions of Co ²⁺∶MgAl₂O₄ passively Q-switched lasers in [100] and [110] are compared. Results show that the [110]-cut crystal has obvious advantages. The output energy is about 8% higher than that of the [100]-cut crystals, and the stability, beam quality, and extinction ratio are improved slightly.