The edge effects of high-power slab lasers cause severe wavefront distortions with large amplitude and gradients, which is a great challenge for the adaptive optics systems for improving the beam qualities. The standard least-squares wavefront reconstruction method would inherently assign higher priorities to correcting the edge aberrations which contribute little to the laser power in the near diffraction-limit areas in the far-field, while the other aberrations are not well corrected. To solve the problems, we propose a least-squares reconstruction algorithm with performance-based filtering, in which the correction capability of the deformable mirror is analyzed in the spatial frequency domain, and then the input phase distortions are filtered accordingly. The uncorrectable components of input distortions are ignored so that the residuals of the correctable components could be further minimized. Experiments with a 20 kW Nd:YAG slab laser indicate that the proposed method is effective to improve the beam quality of high-power slab laser with edge effect.

高功率平板激光器的边缘效应会导致严重的波前畸变，振幅和梯度较大，这对提高光束质量的自适应光学系统来说是一个巨大的挑战。标准的最小二乘波阵面重建方法将固有地赋予较高的优先级，以校正边缘像差，这对远场的近衍射极限区域中的激光功率几乎没有贡献，而其他像差没有得到很好的校正。为了解决这些问题，我们提出了一种基于性能滤波的最小二乘重建算法，该算法在空间频域内分析可变形镜的校正能力，然后对输入相位失真进行滤波。输入失真的不可校正成分将被忽略，以便可校正成分的残差可以进一步最小化。20 kW Nd：YAG平板激光器的实验表明，该方法有效地提高了具有边缘效应的大功率平板激光器的光束质量。