腔内双压电变形镜光强分布优化

报道了把20单元双压电变形镜作为闪光氪灯泵浦的Nd:YAG激光器的腔镜，优化激光器输出光束远场强度分布的实验结果。变形镜由随机并行梯度下降算法控制，以相机采集到的激光束远场环围能量作为算法的评价指标，控制双压电变形镜的面形向远场能量分布更加集中的方向变化。结果表明:系统在20 s内将远场光斑中的多个亮斑校正为单个亮斑，峰值光强与优化前相比提高了5倍；在腔镜倾斜较大时，实验系统将激光器的输出功率由0.006~0.051 W提升至0.330 W，验证了实验系统的有效性。

Optimization of beam intensity distributions with intracavity bimorph deformable mirror

An intracavity adaptive optics system is presented for optimizing beam intensity profiles of an flashlamp-pumped Nd: YAG laser. The rear mirror of the laser is replaced by a 20-element bimorph deformable mirror controlled by a stochastic parallel gradient decent algorithm aiming at achieving more concentrated power distribution in the far-field. Experimental results demonstrate that this system effectively transforms the far-field intensity distribution with multiple lobes into a single bright lobe within only about 20 s, and the peak intensity is improved up to 6 times. The output power can be increased from 0.006-0.051 W to 0.330 W when large misalignment exists. The effectiveness of the proposed system is demonstrated by the above experimental results.