基于集束多频调制的光谱色散匀滑技术  

Smoothing by Spectral Dispersion Technology Based on Bundle Multiple-Frequency Modulation

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] 粟敬钦[1] 

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：《中国激光》2017年第12期225-232,共8页Chinese Journal of Lasers

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：在激光驱动惯性约束聚变研究中,激光等离子体相互作用是影响点火的重要原因之一;为了抑制激光等离子体的不稳定性,诸多光束匀滑技术应运而生,并得到广泛应用。为了获得更匀滑的焦斑,提出集束多频调制光谱色散匀滑(SSD)技术,并对其进行了理论研究;该技术采用多束激光集束聚焦打靶,利用单频调制单光束,利用不同的频率调制不同的子束。结果表明,该技术可以有效抑制多光束干涉导致的强度调制,改善了远场光强分布的均匀性,并且在采用更接近实际情况的色循环数时,具有比传统多频调制SSD技术更好的匀滑效果。In the research on laser driven inertial confinement fusion,laser-plasma interaction（LPI）is a key issue of affecting ignition.Many beam smoothing technologies are proposed and adopted to suppress the instability of laserplasma.To obtain a smoother focal spot,the smoothing by spectral dispersion（SSD）technology based on bundle multiple-frequency modulation is proposed and studied theoretically.The technology adopts one modulation frequency in one single beam,and then a bundle of multiple beams with different modulation frequencies focuses on one point.The results indicate that intensity modulation caused by interference of multiple beams can be suppressed and the uniformity of far field intensity distribution can be improved by the proposed technology.Compared with the traditional multiple-frequency modulation SSD technology,the proposed technology has a better smoothing performance when the color cycle number is closer to practical situation.

关 键 词：激光光学 集束聚焦 多频调制 光谱色散匀滑 惯性约束聚变 辐照均匀性 

分 类 号：TN0[电子电信—物理电子学]