The effect of target materials on colliding laser-produced plasmas
The effect of target materials on colliding laser-produced plasmas
复制标题
靶材对碰撞激光产生等离子体的影响
DOI：
10.1063/1.4944608
复制
发表时间：
2016-04-07
影响因子：
3.2
通讯作者：
Qiu, Aici
中科院分区：
文献类型：
--
作者：
Li, Xingwen;Yang, Zefeng;Qiu, Aici
在激光烧蚀中，使用具有宽范围激光功率密度的纳秒至飞秒激光。在烧蚀过程中，两个等离子体之间的碰撞结果是惯性约束聚变和核天体物理研究人员感兴趣的。本文利用时间-空间分辨成像和光谱技术研究了不同靶材料（Al、Cu和W）的平面靶表面烧蚀的两个种子等离子体的碰撞过程。测量了种子等离子体的初始相对速度和密度，然后计算了碰撞参数，以评估碰撞的程度。此外，通过对空间分辨光谱的分析，研究了材料对原子或离子时空分布的影响。结果表明，在相同的激光强度下，高原子序数（Z）材料的碰撞性参数值较小，这主要是由于其重离子质量的缘故。较高的激光强度会增加初始相对分子质量。
In laser ablation, nanosecond to femtosecond lasers with a wide range of laser power densities are used. During ablation, the result of collisions between two plasmas is of interest to many researchers in inertial confinement fusion and nuclear astrophysics. In this paper, the collisions of two seed plasmas ablated from planar target surfaces of different target materials (Al, Cu, and W) were studied with temporal-spatially resolved imaging and spectroscopy. The initial relative velocities and densities of the seed plasmas were measured, and then the collisional parameters were calculated to evaluate the degree of the collisions. In addition, spatially resolved spectra were analyzed to study the influences of materials on the temporal-spatial distribution of atom or ions. The results indicated that under the same laser intensity, the high atomic number (Z) material had a small value of collisionality parameter, mostly because of its heavy ion mass. Higher laser intensity would increase the initial relativ...