多脉冲高能量强激光诱导产生Al等离子体发射光谱分析
Emission spectra of aluminum plasma induced by high energy and multi-pulse laser
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摘要: 用Nd:YAG脉冲激光器产生的1.064 μm激光，在空气环境下作用于金属Al诱导产生等离子体，获得了不同能量以及多次脉冲烧蚀下的Al等离子体发射光谱，分析了谱线强度与能量变化之间的关系，实验结果表明：随激光能量的增加，谱线的信号强度明显增强；对等离子体光谱进行Lorentz线型拟合，获取了谱线的半高宽，以此来计算电子密度，得到了电子密度及信号强度随多脉冲强激光诱导次数的增加而逐渐下降的演化规律。Abstract: Intensities of emission spectra of laser-induced alloy-aluminum plasma, with use of neodymium YAG laser (laser pulse energy is 6~10 J), were experimentally studied in air atmosphere. Emission spectra of laser-induced aluminum plasma of 6~10 J energy were obtained. Relationship between spectral line intensity and laser energy were analyzed. Experimental results show that signal intensity of spectral line increases with increasing of laser energy. In addition, half width of spectral line was obtained by Lorentz linear fitting of plasma spectra, in order to calculate electron density. Electron density and signal intensities will decrease gradually with increasing of shock time.
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Key words:
- spectral line /
- laser-induced plasma /
- electron density /
- laser energy
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