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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

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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。

Abstract

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 laser-plasma. 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.

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中图分类号:TN241

DOI:10.3788/cjl201744.1205003

所属栏目:光束传输与控制

基金项目: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)

收稿日期:2017-07-14

修改稿日期:2017-08-08

网络出版日期:--

作者单位    点击查看

郑天然:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900中国工程物理研究院研究生院, 北京 100088
张颖:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
耿远超:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
黄晚晴:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
刘兰琴:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
孙喜博:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
王文义:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
李平:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
张锐:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900
粟敬钦:中国工程物理研究院激光聚变研究中心, 四川 绵阳 621900

联系人作者:张颖(zhangying@tsinghua.org.cn)

备注:郑天然(1993-), 男, 硕士研究生, 主要从事高功率激光技术方面的研究。E-mail: 541756848@qq.com

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引用该论文

Zheng Tianran,Zhang Ying,Geng Yuanchao,Huang Wanqing,Liu Lanqin,Sun Xibo,Wang Wenyi,Li Ping,Zhang Rui,Su Jingqin. Smoothing by Spectral Dispersion Technology Based on Bundle Multiple-Frequency Modulation[J]. Chinese Journal of Lasers, 2017, 44(12): 1205003

郑天然,张颖,耿远超,黄晚晴,刘兰琴,孙喜博,王文义,李平,张锐,粟敬钦. 基于集束多频调制的光谱色散匀滑技术[J]. 中国激光, 2017, 44(12): 1205003

被引情况

【1】田玉婷,邬融,孙明营,张军勇,张艳丽,杨野,周申蕾. 非线性调制影响束匀滑相位板离焦性能的研究. 光学学报, 2018, 38(10): 1014003--1

【2】郑天然,张颖,耿远超,黄晚晴,刘兰琴,孙喜博,王文义,李平,张锐,胡东霞. “强度扫动”光束匀滑特性的理论研究. 激光与光电子学进展, 2018, 55(11): 111405--1

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