强场物理中自生磁场的实验研究  

Experimental study of spontaneous magnetic field in high field physics

作　　者：王光昶[1] 牟洪臣[2] 陈旭[1] 梁栋[1] 张建炜[1] 郑志坚[3] WANG Guang-Chang;MU Hong-Chen;CHEN-Xu;LIANG-Dong;ZHANG Jian-Wei;ZHENG Zhi-Jian(Teaching and Research Section of Physics,Chengdu Medical College,Chengdu 610500,China;College of Physics and Electronic Engineering,Harbin Normal University,Harbin 150080,China;Research Center of Laser Fusion,CAEP,Mianyang 621900,China)

机构地区：[1]成都医学院物理教研室,成都610500 [2]哈尔滨师范大学物理与电子工程学院,哈尔滨150080 [3]中国工程物理研究院激光聚变研究中心,绵阳621900

出　　处：《原子与分子物理学报》2021年第2期102-106,共5页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(10535030);发育与再生四川省重点实验室基金重点项目(SYS12-003)。

摘　　要：为了获得飞秒激光与固体靶相互作用中自生磁场的大小与空间分布情况,利用光学多道分析(OMA)谱仪(谱分辨0.1 nm)加电荷耦合器件(CCD)相机(1152×1242)探测设备,用消色差的相机镜头作为空间分辨,在固体靶前表面测量了激光的高次谐波(nω_(0))光谱,观测到了nω_(0)光谱的精细结构及其频率间隔Δω,由此推出激光与固体靶相互作用中产生的等离子体内的自生磁场达60-70特斯拉(T)量级,且越接近靶法线方向磁场越强,其一维空间分布为环形.这一结果为进一步研究强场物理中自生磁场的特性及等离子体的整体行为提供了依据.To obtain the magnitude and spatial distribution of spontaneous magnetic field in the interaction between femtosecond laser and solid target,optical multichannel analysis(OMA) spectrometer and charge coupled device(CCD) camera(1152 × 1242) detection equipment are employed,and an achromatic camera lens is used as spatial resolution.The higher harmonic(nω_(0)) spectrum of laser is measured in front of the solid target surface,then the fine structure and the frequency interval Δω of nω_(0) spectrum are observed,which indicates that the spontaneous magnetic field of plasma generated by the interaction between laser and solid target is up to 60-70 tesla(T) level,and the closer to the normal direction of the target,the stronger the magnetic field,whose one-dimensional space distribution is ring-shaped.The results will provide a basis for the further study of the characteristics of spontaneous magnetic field in high field physics and the overall behavior of plasma.

关 键 词：飞秒激光 OMA谱仪 谐波光谱 精细结构 自生磁场 

分 类 号：O434.12[机械工程—光学工程]