To meet the requirements for far-field laser beam irradiation strength, and reduce the impact of thermal effect on the output beam performance, this paper introduces a lower order aberration correction method based on beam shaping. According to the beam wavefront distortion, the method dynamically adjusts the space between shaping mirrors to produce opposite aberrations to correct the aberrations of the first four orders, through the rapid action of the high-precision translation stage and the fast steering mirror, and then the output beam recovers and emits parallelly. The method significantly reduces the thermal drift and thermal distortion of the laser beam, and avoid the long-time continuous beam radiation while running. It features large correction range, control convenience and compact structure, and can greatly improve the quality of the laser output beam and the effect of the laser beam far-field.%为满足激光束对远处目标辐照强度的要求,减小热效应对输出光束性能的影响,提出了一种基于整形光路的高能激光低阶像差校正方法.该方法根据波前探测器测到的光束波前畸变,利用激光器整形光路同有的光学元件和调整机构,通过高精密电动平移台和快反镜的快速动作,动态调整各镜片的间距,实时校正激光束的低阶像差,使输出光束恢复至平行出射,从而显著减小激光束的热漂移和热畸变,有效避免了长时间出光时光束的持续发散,极大改善了输出光束性能.试验结果表明,该方法具有校正量大、控制方便、结构紧凑等优点,能够很好地改善激光器输出光束质量,显著提高激光束远场作用效果.
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