振幅调制平顶光束在靶腔内的光强分布特性  

Intensity Distribution Characteristics of Flat-Top Beam After Amplitude Modulation in Target Cavity

作　　者：苏倩倩 汤梦饶 Su Qianqian;Tang Mengrao(School of Electronics and Electrical Engineering,Xiamen Institute of Technology,Xiamen 361021,Fujian,China)

机构地区：[1]厦门工学院电子与电气工程学院,福建厦门361021

出　　处：《激光与光电子学进展》2022年第19期217-221,共5页Laser & Optoelectronics Progress

基　　金：2020年福建省中青年教师教育科研项目科技A类(JAT200835);电子与电气工程学院2020年度院级科研项目(EEKY202002);厦门工学院嵌入式人工智能计算及应用科研创新团队(KYTD202003)。

摘　　要：推导出了平顶高斯光束经有限个小尺寸振幅调制型缺陷调制聚焦后,激光间接驱动聚变靶腔内及腔壁的光场分布解析式,详细研究了缺陷尺寸和调制幅度等因素对光强分布的影响,并进一步研究了入射角度对调制光束在腔壁上投影衍射光场的影响。结果表明:缺陷尺寸越大,缺陷调制幅度越大,光束受到的扰动越明显,调制光场恢复为平顶高斯分布所需的传输距离越远;当光束的入射角小于10°时,光束到达腔壁前经过的路径较长,调制后的平顶高斯光束在腔壁上投影的光斑往x轴方向扩散,缺陷引起的光强扰动变化明显减弱,光斑强度整体下降。In this paper,the analytical expression of the light field distribution in the cavity and the wall of the laser indirect driven fusion target after the flattop Gaussian beam is focused by the finite number of small amplitude modulated defects are derived.The influence of the size of the defect and the modulation amplitude on the intensity distribution is studied in detail.The influence of incident angle on the diffracted light field of the modulated beam projected onto the cavity wall is further studied.The results show that the larger the size of the defect,the larger the modulation amplitude of the defect,the more obvious the disturbance of the beam,and the longer the transmission distance required for the optical field distribution to be restored to the flattop Gaussian distribution.When the incident angle of the incident beam is less than 10°,the path of the beam before reaching the cavity wall is long,and the spot projected by the modulated flattop Gaussian beam on the cavity wall diffuses to the xaxis direction.The change of intensity disturbance caused by defect is obviously weakened,and the spot intensity decreases as a whole.

关 键 词：激光光学 平顶高斯光束 振幅调制 光强分布 

分 类 号：O436.[机械工程—光学工程]