中国激光, 2020, 47 (8): 0811002, 网络出版: 2020-08-17
平行板约束对激光诱导PMMA等离子体中CN分子光谱的影响 下载: 612次
Effect of Parallel Plate Constraint on CN Molecular Spectra in Laser-Induced PMMA Plasma
光谱学 激光诱导击穿光谱 空间约束 光谱增强 振动温度 spectroscopy laser-induced breakdown spectrum spatial confinement spectral enhancement vibration temperature
摘要
在大气环境中,研究平行板约束对激光诱导PMMA等离子体中CN分子光谱的影响,测量得到的5条光谱峰所处波长分别为388.29 nm(0-0)、387.0 nm(1-1)、386.14 nm(2-2)、385.44 nm(3-3)及385.03 nm(4-4)。实验结果表明,空间约束下的CN分子光谱峰强度明显高于无空间约束下的。另外,通过拟合CN光谱获得了CN分子的振动温度,结果显示,空间约束下的CN分子的振动温度明显高于无空间约束下的振动温度,且高激光能量下的CN分子振动温度高于低激光能量下的振动温度。平行板反射冲击波压缩等离子体羽,使得其温度和数密度增加,增强了激光诱导PMMA等离子体中CN分子的光谱强度。
Abstract
This study investigates the effect of parallel plate confinement on the spectra of the CN molecule in laser-induced PMMA plasma in the atmospheric environment. The wavelength of five measured spectral peaks are 388.29 (0-0), 387.0 (1-1), 386.14 (2-2), 385.44 (3-3), and 385.03 nm (4-4). The experimental results show that the spectral peak intensity of the CN molecule with spatial confinement is stronger than that without spatial confinement. Moreover, the vibrational temperature of the CN molecule is calculated by fitting the CN spectra. The calculated vibrational temperature of the CN molecule with spatial confinement is higher than that without spatial confinement, and the vibrational temperature at high laser energy is higher than that at low laser energy. The shock waves reflected by the parallel plate compress the plasma plume and increase its temperature and number density. Thus, the spectral intensity of the CN molecule in laser-induced PMMA plasma is improved.
杨雪, 陈安民, 李苏宇, 姜远飞, 金明星. 平行板约束对激光诱导PMMA等离子体中CN分子光谱的影响[J]. 中国激光, 2020, 47(8): 0811002. Yang Xue, Chen Anmin, Li Suyu, Jiang Yuanfei, Jin Mingxing. Effect of Parallel Plate Constraint on CN Molecular Spectra in Laser-Induced PMMA Plasma[J]. Chinese Journal of Lasers, 2020, 47(8): 0811002.