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对磁场约束下激光诱导铜等离子体光谱强度演化进行了实验研究,分析了在磁场约束环境下的等离子体光谱强度演化过程以及激光能量对光谱增强的影响.实验结果表明:在磁场约束下铜等离子体内原子光谱和离子光谱均有所增强,在磁场约束下Cu I 510.55 nm谱线强度时间演化过程中在1.2—5.7μs时间范围内附近出现双峰结构,在距离靶材表面0—1.4 mm空间范围内磁场约束Cu I 510.55 nm光谱增强明显.Cu I510.55 nm和Cu I 515.32 nm光谱增强因子随激光能量的增加呈单调递减变化,激光能量20 mJ时增强因子最大分别为11和8.对磁场约束下等离子体发射光谱强度增强的物理原因进行了探讨.
The evolution of laser induced plasmonic intensity under the confinement of magnetic field was experimentally studied, and the evolution of the plasma spectral intensity under laser confinement and the effect of laser energy on the spectral enhancement were analyzed.The experimental results show that under the confinement of magnetic field, the copper plasma In vivo atomic and ion spectra were enhanced. The bimodal structure appeared near the time range of 1.2-5.7μs during Cu Ⅰ 510.55 nm line-time evolution under the magnetic field confinement. At a distance of 0-1.4 mm from the target surface The magnetic field confined Cu I 510.55 nm enhanced significantly.Cu I510.55 nm and Cu I 515.32 nm monotonically decreased with the increase of laser energy and the maximum enhancement factor was 11 and 8 at laser energy of 20 mJ respectively The physical reason why the intensity of the plasma emission spectrum is enhanced under the magnetic field is discussed.