为了校正板条激光器输出光束波前像差，改善输出光束质量，提出了基于37单元双压电片变形镜的板条激光光束净化系统。采用柱面反射式单向扩束器使主振荡功率放大结构板条激光器输出光束尺寸与37单元双压电片变形镜有效口径相匹配，利用随机并行梯度下降算法控制双压电片变形镜面形，进行波前像差闭环校正，校正后光束远场归一化桶中功率提高到净化前的2~3倍。

A laser beam cleanup system based on a 37-element bimorph deformable mirror (DM) is presented, to correct the wavefront aberrations of slab laser amplifier and improve the output laser beam quality. The strip-shaped laser beam is expanded by a cylinder mirrors expander to match with the bimorph DM. The stochastic parallel gradient descent (SPGD) algorithm is utilized to optimize the surface of bimorph DM. The normalized power in the bucket (NPIB) of laser beam is enhanced by 2-3 times, after the wave-front aberrations are corrected.