“强度扫动”光束匀滑特性的理论研究  

Theoretical Research of "Intensity Sweep" Laser Beam Smoothing Characteristics

作　　者：郑天然[1,2] 张颖 耿远超[1] 黄晚晴[1] 刘兰琴[1] 孙喜博[1] 王文义 李平[1] 张锐[1] 胡东霞[1] Zheng Tianran;Zhang Ying;Geng Yuanchao;Huang Wanqing;Liu Lanqin;Sun Xibo;Wang Wenyi;Li Ping;Zhang Rui;Hu Dongxia(Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang,Sichuan 621900,China;Graduate School of China Academy of Engineering Physics,Beijing 100088,China)

机构地区：[1]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [2]中国工程物理研究院研究生院,北京100088

出　　处：《激光与光电子学进展》2018年第11期300-306,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61475145);中国工程物理研究院科学技术发展基金(2014A0401018);等离子体重点实验室基金(9140C680604150C68299)

摘　　要：理论阐述了光谱色散匀滑(SSD)技术的物理内涵,即SSD的焦斑匀滑效果来源于远场基元电场相位随时间的演化,在实际应用中不存在"运动"焦斑的物理图像。在此基础上,建立了远场强度分布形式不变但空间位置随时间变化的"强度扫动"光束的理论模型,通过数值模拟研究其匀滑特性,并与SSD的匀滑效果进行了对比分析。The physical content of smoothing by spectral dispersion （SSD） technology is theoretically explained that the focal spot smoothing effect of SSD results from the temporal change of the far-field primitive electric field phase, and there is no physical image of ＂ moving＂ focal spot in the practical application of SSD. On this basis, the theoretical model of ＂intensity sweep＂ laser beam, which has a far-field intensity distribution with constant form but temporal changed spatial position, is established. The smoothing characteristics of the beam are studied by numerical simulation compared with that of SSD.

关 键 词：激光光学 光谱色散匀滑 强度扫动 惯性约束聚变 辐照均匀性 

分 类 号：TN241[电子电信—物理电子学]