Dynamics and density distribution of laser-produced plasma using optical interferometry
Dynamics and density distribution of laser-produced plasma using optical interferometry
复制标题
使用光学干涉测量激光产生的等离子体的动力学和密度分布
DOI：
10.1063/1.5028414
复制
发表时间：
2018-06-01
影响因子：
2.2
通讯作者：
Dong, C. Z.
中科院分区：
文献类型：
--
作者：
Cao, S. Q.;Su, M. G.;Dong, C. Z.
利用光学干涉测量技术研究了空气中激光等离子体的动态演化和时空分辨密度分布。在脉冲能量为50 mJ、延迟时间为50 ns至2650 ns的情况下获得了一系列干涉图。随着延迟时间的增加，冲击波的膨胀轮廓由扁椭球体变为椭球体。相移已被提取使用二维（2D）快速傅立叶变换算法和折射率的径向分布计算使用逆阿贝尔变换假设等离子体是轴对称的沿着入射激光束的方向。利用折射率的空间依赖性，得到了等离子体羽流和激波的二维膨胀和演化的干涉图。根据得到的折射率分布计算了等离子体区的电子密度和压缩空气区的空气密度。我们的结果提供了进一步的理解的扩展和动态演化的激光产生的等离子体和冲击波和时空演化的等离子体密度在空气中。出版社：AIP Publishing
Dynamic evolution and spatio-temporally resolved density profiles of laser-produced plasma in air were investigated using optical interferometry. A series of interferograms were obtained with a pulse energy of 50 mJ and delay times from 50 ns to 2650 ns. With increasing delay time, the expansion profiles of the shock wave change from a flat ellipsoid to a spheroid. The phase shift has been extracted using a two-dimensional (2D) fast Fourier transformation algorithm and the radial distribution of the refractive index is calculated using the inverse Abel transformation assuming that the plasma is axisymmetric along the direction of the incident laser beam. Interferograms of the 2D expansion and evolution of the plasma plume and the shock wave were obtained by exploiting the spatial dependence of the refractive index. The electron densities in the plasma region and the air densities in the compressed air region were calculated from the refractive-index distributions obtained. Our results provided further understanding of the expansion and the dynamic evolution of the laser-produced plasma and the shock wave and of the spatio-temporal evolution of the density of plasma in air. Published by AIP Publishing.