磁约束飞秒激光诱导铜等离子体特性研究

许东华; 宋超; 赵上勇; 高勋; 林景全

doi:doi:10.3788/gzxb20184708.0847012

光子学报, 2018, 47 (8): 0847012, 网络出版: 2018-09-16

磁约束飞秒激光诱导铜等离子体特性研究

Magnetic Confinement Effect on Femtosecond Laser-induced Copper Plasma

论文大纲

许东华 ^1,*宋超 ²赵上勇 ¹高勋 ¹林景全 ¹

作者单位

¹ 长春理工大学理学院, 长春 130022

² 长春理工大学化学与环境工程学院, 长春 130022

摘要

建立磁约束飞秒激光诱导铜等离子体辐射光谱采集系统, 通过发射光谱法分析磁约束效应对飞秒激光诱导铜等离子体特性的影响.在强度为0.67 T的稳磁场约束下, 等离子体辐射连续谱和分立谱均有增强, 分立谱线增强更显著; 铜原子上能级越高, 其辐射的原子谱线增强因子越大, 具有最高上能级的Cu I 507.6 nm增强因子最大, 为2.8; 等离子体铜原子谱线持续时间明显延长, 在等离子体演化初期, 谱线增强显著, 在较大延时, 谱线增强迅速减弱; 等离子体电子温度和电子密度均有提高.

Abstract

The spectroscopy collection system of femtosecond laser-induced copper plasma with magnetic confinement was established. The magnetic confinement effects in the femtosecond laser-induced Cu plasma were investigated by optical emission spectroscopy. When plasma was confined by magnetic field with intensity of 0.67 T, the plasma emission continuous and discrete spectrum enhanced meanwhile the discrete spectrum enhanced more significantly. The enhancement factor of Cu atomic line with higher upper level energy is larger. The Cu I 507.6 nm is emitted from the highest upper level energy; its enhancement factor is largest and could be up to 2.8. The persistence duration of copper atomic spectra last longer. The copper atomic spectra enhanced significantly in the early delay time and weakly in late delay time. The electron temperature and number density of plasma in magnetic filed improved.

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许东华, 宋超, 赵上勇, 高勋, 林景全. 磁约束飞秒激光诱导铜等离子体特性研究[J]. 光子学报, 2018, 47(8): 0847012. XU Dong-hua, SONG Chao, ZHAO Shang-yong, GAO Xun, LIN Jing-quan. Magnetic Confinement Effect on Femtosecond Laser-induced Copper Plasma[J]. ACTA PHOTONICA SINICA, 2018, 47(8): 0847012.

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