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基于受激布里渊散射的位相共轭激光器能够产生自调Q脉冲并有效改善光束质量,分析了位相共轭激光器的自调Q机理,认为SBS属于快开关,可以采用阶跃函数描述而无需考虑过渡腔中复杂Q值变化过程,分析了起始腔后反射率、耦合输出率以及SBS饱和反射率对Q调制过程以及输出脉冲时域和能量特性的影响,认为在设计SBS激光器时应在保持阈值前提下选取具有较低后反射率的腔镜和具有较高SBS饱和反射率的介质,在综合考虑耦合输出效率前提下优化选取合适的耦合输出率。
The phase conjugate laser based on stimulated Brillouin scattering can generate self-Q pulse and effectively improve the beam quality. The self-adjusting Q mechanism of phase conjugate laser is analyzed. It is considered that SBS belongs to the fast switch and can be described by the step function without Considering the complex Q value changing process in the transition cavity, the influence of the initial cavity cavity reflectivity, the coupling output rate and the SBS saturation reflectivity on the Q modulation process and the output pulse time-domain and energy characteristics are analyzed. The design of the SBS laser should be based on Under the premise of keeping the threshold, the mirror with lower post-reflectivity and the medium with higher SBS saturation reflectivity are selected, and the proper coupling output rate is optimized under the premise of considering the coupling output efficiency.