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通过理论分析和数值计算,对Cr4+:YAG飞秒脉冲激光器光路结构的优化设计进行了研究。提出了在谐振腔内插入一薄聚焦透镜代替另一折叠镜以降低光路的复杂性。为研究起色散补偿作用的棱镜对对腔的稳定性和像散带来的影响,导出了棱镜对的光传输矩阵。通过编程计算得出了连续运转和锁模运转两种工作方式下的不同参数的谐振腔稳区图,对激光器工作点的选择做出了论述。定义了像散补偿失配因子F,做出了像散补偿区域分布图。指出F<0.05的区域具有良好的像散补偿特性,也是激光器光路结构参数设计必须要考虑的重要方面。论证了改变抽运光聚焦透镜的位置可实现抽运光与腔内振荡光的匹配。
Through theoretical analysis and numerical calculation, the optimal design of the optical path structure of Cr4 +: YAG femtosecond pulse laser was studied. The complexity of inserting a thin focusing lens in the cavity instead of another folding mirror to reduce the optical path is proposed. In order to study the influence of the prism which plays the role of dispersion compensation on the stability of the cavity and the astigmatism, the light transmission matrix of the prism pair is derived. The steady-state diagram of the resonator with different parameters under two operation modes of continuous operation and mode-locked operation is obtained by programming calculation, and the selection of the working point of the laser is discussed. The astigmatism compensation mismatch factor F is defined, and the astigmatism compensation area distribution map is made. It is pointed out that the region of F <0.05 has good astigmatism compensation characteristics and is also an important aspect that must be considered in designing the optical path structure parameters of the laser. It is demonstrated that the change of the position of the pump focusing lens can match the pump light with the cavity light.