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光束质量是激光器的关键技术指标之一,利用自适应光学系统可以显著提升激光器的输出光束质量.本文研究了一种脉冲板条固体激光近场光强分布特性,利用哈特曼传感器测量了波前像差并进行了波前复原,修正了衍射极限倍数β值的计算方法.介绍了变形镜校正波前像差的理论模型,仿真计算了59单元变形镜对测量波前的校正情况,仿真计算校正后的远场峰值光强提高了3.2倍,衍射极限倍数β值提高了近3倍,校正效果明显.搭建了脉冲板条固体激光光束净化实验平台,开展了验证性实验研究,实验结果表明,利用59单元变形镜的自适应光学系统可以有效提升脉冲板条固体激光的输出光束质量,远场峰值光强提高了3倍,衍射极限倍数β值提高了约3倍,与仿真分析结果基本一致.本文的研究结论为后续将脉冲固体激光光束质量提升到近衍射极限水平提供了参考.
The beam quality is one of the key technical indexes of the laser, the output optical quality of the laser can be significantly improved by using the adaptive optics system.This paper studies the near-field light intensity distribution characteristics of a pulsed slab solid laser, Front aberration and wavefront reconstruction, the correction of the diffraction limit multiplier β value of the calculation method.Described by the deforming mirror to correct the theoretical model of the wavefront aberration, the simulation of the 59 unit deformable mirror calibration of the measured wavefront, simulation The corrected far-field peak intensity is increased by 3.2 times and the diffraction limit multiple β is increased by nearly 3 times, and the correction effect is obvious. The experimental platform for purifying pulsed slab solid laser beam is set up and the experimental results are verified The results show that the adaptive optical system using 59-unit deformable mirror can effectively improve the output beam quality of pulsed slab solid-state laser. The far-field peak light intensity is increased by 3 times and the diffraction limit multiple β is increased by about 3 times. Compared with the simulation results Which is basically the same.The conclusion of this paper provides a reference for the subsequent improvement of the quality of pulsed solid laser beam to near diffraction limit.