全频分段控制下连续相位板的优化设计  

Optimal Design for Continuous Phase Plate under Segmental Control Across Full-Spectrum

作　　者：朱应成 邬融[1] 张军勇[1] 周申蕾[1] Zhu Yingcheng;Wu Rong;Zhang Junyong;Zhou Shenlei(National Laboratory on High Power Laser and Physics,Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences,Shanghai 201800 2 University of Chinese Academy of Sciences,Beijing,China;100049,Chin)

机构地区：[1]中国科学院上海光学精密机械研究所高功率激光物理联合实验室,上海201800 [2]中国科学院大学,北京100049

出　　处：《光学学报》2018年第7期281-287,共7页Acta Optica Sinica

摘　　要：为了提高聚焦光束质量,针对高功率激光驱动器的连续相位板(CPP)进行设计,改进了传统盖斯贝格-撒克斯通(G-S)算法的设计。设计基于分步分段控制相位板频谱的目标,约束初始相位的选取,保留带有目标焦斑低频信息的初始相位信息,在迭代过程中适当控制中高频信息。实验结果表明,相对于传统随机连续初始相位,改进后CPP作用下的焦斑顶部光强方均差误差(RMS)能更快地收敛到目标阈值。改进的初始相位不仅避免了G-S算法可能产生局部最优的问题,而且也能很好地应用于非对称焦斑的设计。We design a kind of continuous phase plate（CPP）used in high power laser driver to improve the focus beam quality.The optimal design based on controlling segmented spatial spectrum is modified from traditional G-S algorithm.The improved algorithm chooses a restrained initial phase that is related with the low frequency information of goal focal spots spatial spectrum,and the medium frequency and high frequency can be appropriately controlled in iterations.The experimental results show that the root mean square error（RMS）of the focal spot can quickly converge to the target threshold under the effect of improved CPP,which compared with that under the effect of the traditional random continuous initial phase.The improvement of initial phase not only can avoids the G-S algorithm easily produces local optimum value,but also the improved method has a good application for the design of asymmetric focal spot.

关 键 词：光学器件 光束质量 连续相位板 盖斯贝格-撒克斯通算法 初始相位 

分 类 号：TN241[电子电信—物理电子学]