Effect of distance between the laser spot and the cavity center on spatially confined laser-induced copper plasma
Effect of distance between the laser spot and the cavity center on spatially confined laser-induced copper plasma
复制标题
激光光斑与腔中心距离对空间受限激光诱导铜等离子体的影响
DOI：
10.1063/1.5080181
复制
发表时间：
2019
期刊：
影响因子：
1.6
通讯作者：
Dong Fengzhong
中科院分区：
文献类型：
--
作者：
Jia Junwei;Fu Hongbo;Wang Huadong;Ni Zhibo;Dong Fengzhong
研究了激光光斑与腔中心之间的距离对空间受限激光诱导空气中铜等离子体的影响。用不同直径(2 mm、3 mm、4 mm和5 mm)和高度(2 mm、4 mm、6 mm和8 mm)的空间圆柱腔对等离子体进行约束，当激光光斑位于同一腔内的不同位置时，观察到不同的增强效果。在距离为0 mm、延迟2.5μ的S实验中测得铜原子线光谱强度的最大增强因子约为9。用Boltzmann图方法计算了包括5条铜原子线(324.75 nm、327.40 nm、510.55 nm、515.32 nm和521.82 nm)的等离子体温度。等离子体温度的升高与光谱强度具有相似的趋势，也表现出强烈的距离依赖性。结果表明，对于反射冲击波的均匀均衡压缩，空腔中心的增强作用最为显著。
We investigated the effect of distance between the laser spot and the cavity center on spatially confined laser-induced copper plasma in air. Spatial cylindrical cavities with various diameters (2mm, 3mm, 4mm and 5mm) and heights (2mm, 4mm, 6mm and 8mm) were used to confine the plasma, and different enhancements were observed when the laser spot at different locations in the same cavity. The maximum enhancement factor for the spectral intensity of Cu atomic line to be around 9 was measured at a time delay of 2.5μs when the distance was 0mm. The plasma temperature was calculated by the Boltzmann plot method, including five Cu atomic lines (324.75nm, 327.40nm, 510.55nm, 515.32nm and 521.82nm). The enhancement of the plasma temperature had a similar trend with the spectral intensity and also showed a strong dependence on the distance. The results demonstrated that the enhancement effect at the center of the cavity was the most significant for the uniform and balanced compression of the reflected shock waves ...