二元光学在强激光波面整形中的应用

文章首先介绍了二元光学波面整形器件的理论基础。在分析GS、YG等正反迭代算法存在问题的基础上，提出三种优化算法，即全局/局部联合搜索算法（GLUSA）、爬山-模拟退火混合算法及多分辨率的混合优化算法。以惯性约束核聚变中光束匀滑为例，进行了二元光学器件的位相设计，获得了良好的位相结构与焦斑性能。采用旋转镂空掩膜板制作了准连续位相器件，并利用CCD与多种光强衰减片进行焦斑光强测量。实验结果表明：获得了较好的顶部均匀性、陡边、小旁瓣、高主瓣能量利用率以及光斑中心没有锐脉冲的光强分布。

Binary optics used in high power laser shaping

The principle of binary optics used for beam shaping is introduced.On the basis of the analysis of GS and YG algorithms,three algorithms are developed for phase design of the Binary Optical Element(BOE),including Global/local united searching algorithm(GLUSA),hybrid algorithm combining Hill climbing with Simulated Annealing and its multi resolution algorithm.For example,the BOE obtaining uniform focused spot for Inertial Confinement Fusion(ICF)is designed by the above algorithms.The simulated results show that fine phase structure and good characters of the focused spot are realized by using the hybrid algorithm.A continuous phase plate is manufactured with a rotating hollowed out mask.The intensity distribution of the focused spot is measured by a common CCD and multi attenuators with which the measurement dynamic range is increased.The experimental results after data processing show that the focused spot with steep edge,low side lobe,high light efficiency and fair uniformity of the main lobe without sharp peak at the zero order is obtained.