激光诱导Cu等离子体发射光谱分析

Emission Spectrum Analysis of Copper Plasma Induced by Laser

利用Nd:YAG脉冲激光器,在空气环境下作用于金属材料Cu,分别获得了119.1、154.6、201.7、256.2 m J?Pulse^(-1)四种不同能量下的等离子体特征谱线,选取CuΙ510.5 nm和521.8 nm两条谱线作为研究对象,分析了谱线强度与能量变化之间的关系,发现其展宽线型分别为Lorenz线型和Gauss线型。结果表明,对于Cu等离子体发射光谱,不同波段所对应谱线的展宽机制不同,随着激光能量的增大,谱线的强度逐渐增大,谱线的半宽高也随着激光能量的增加有所增大。

By using of Nd：YAG pulse laser, spectral lines of copper are experimentally studied in air atmo-sphere. The plasma characteristic spectral line of copper is obtained by 119.1, 154.6, 201.7 and 256.2 m J·Pulse^（-1） energy. Cu I 510.5 nm and 521.8 nm are selected as the research object. The relationship between spectral line in-tensity and laser energy is analyzed and it is found that the broadening line is Lorenz and Gauss respectively. Theresults show that different bands correspond to different spectral broadening mechanism for Cu plasma emissionspectrum and with the increasement of laser energy, the spectral line intensity is increased gradually, and the fullwidth at half maximum（FWHM） of the spectral lines also increased.