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

作　　者：姚红兵[1] 孟春梅[1] 张永康[1] 佟艳群[1] 管海兵[1] 

机构地区：[1]江苏大学机械学院,光子制造科学与技术省重点实验室,江苏镇江212013

出　　处：《强激光与粒子束》2011年第8期2111-2115,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(5073500110804037);江苏省博士研究生创新基金项目(CX09B_190Z);博士后科学基金项目(20070411022200902506)

摘　　要：用Nd:YAG脉冲激光器产生的1.064μm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。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.

关 键 词：发射光谱 激光诱导等离子体 电子密度 激光能量 

分 类 号：O536[理学—等离子体物理]