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为了提高惯性约束聚变高功率激光系统的整体效率和充分利用光能,需要将高斯分布的光束整形为空间均匀分布的平顶光束。本文从球面透镜的琼斯矩阵出发,利用光学传输矩阵对双折射透镜组空间光束整形系统进行了理论分析,数值模拟了整形效果,讨论了透镜组参量的选择以及中心加工厚度误差等因素带来的影响,并对该系统进行了实验研究。在实验中,利用该双折射透镜组整型系统实现了光束的均匀化输出。在神光Ⅱ第九路中,在近场静态工作条件下,可将光束填充因子从原来的66%提高到80%。
In order to improve the overall efficiency of the inertial confinement fusion high power laser system and make full use of the light energy, it is necessary to shape the Gaussian distributed beam into a flattened beam uniformly distributed in space. Based on the Jones matrix of the spherical lens, the optical transmission matrix is used to analyze the spatial beam shaping system of the birefringent lens group. The numerical simulation of the shaping effect and the selection of the lens group parameters and the thickness error of the center processing are discussed Influence, and carried on the experimental research to this system. In the experiment, using the birefringent lens grouping system to achieve uniform beam output. In the ninth road of ShenGuang Ⅱ, the beam filling factor can be increased from 66% to 80% in the near-field static working condition.