为实现激光束形状的二维整形,同时灵活适应入射光束发散角、尺寸等参数的变化,提高光束质量,提出了一种适用于大长宽比、变发散角的激光束二维变焦整形方法。该方法利用光线变换矩阵方法分析光路,采用柱透镜、球透镜对光束进行二维变焦整形,通过镜片位置和间距的动态调节,实现对光束在x，y两个维度上的尺寸、发散角共四个参数各自独立的调整,实时校正激光束的低阶像差,使出射光束始终保持为预定状态。试验研究表明,该方法具有光路结构简单、综合像差小、调节范围大等优点,能够显著改善高功率激光器的光束质量,尤其适用于具有大长宽比增益区的板条激光器和化学激光器的输出光束整形。

To achieve two-dimensional beam shaping, adapt to the parameter variation of divergence angle and beam size, improve beam quality, the article presents a two-dimensional beam shaping method for beams with large aspect ratio and variable divergence angle. Using beam transform matrix to analyze light path, adopting cylindrical lens and spherical lens for two-dimensional beam shaping, and adjusting lens positions and intervals dynamically, the method realizes separate regulation in dimensions x and y of beam size and divergence angle, corrects the lower order aberrations in real time, thus outputs beam of predetermined shape. Experimental study shows that the method has the advantages of simple structure, small comprehensive aberration and large adjustable range.