为了解决板条激光器输出激光光束质量不高的问题，建立了激光在板条激光模块中沿“之”字形光路传输时的热致波前畸变模型。对热致波前畸变的分布特点进行了研究，并提出了一种减小热致波前畸变的方法。数值仿真结果表明，通过合理的光路设计，优化激光以同一角度两次进入板条介质时的位置偏移量，可以达到减小板条厚度方向上热致波前畸变的目的。

In order to solve the problem of poor output beam quality of slab lasers, we establish a thermal-induced wavefront-distortion model of the lasers transfer along zigzag in slab laser module. Distribution characteristics of thermal-induced wavefront-distortion are studied and a method for reducing thermal-induced wavefront-distortion is proposed. Numerical simulation results show that the position offsets of laser beam propagating through the slab medium twice at the same angle can be optimized to eliminate the thermal-induced wavefront-distortion in thickness direction of slab with the help of reasonable optical path design.