利用Nd:YAG激光器产生的1064 nm、10 ns脉冲激光聚焦在空气中的Ti靶,观测了激光诱导Ti等离子体发射光谱.调节激光能量为45 mJ/pulse,分析了时间范围在0到4000 ns的时间分辨发射光谱和谱线轮廓以及展宽.在局部热力学平衡(LTE)条件下,利用Saha-boltzmann图法拟合电子温度,Saha方程计算电子密度,讨论了等离子体电子温度和电子密度随时间的演化规律.结果表明,在所讨论的时间范围内,谱线的强度在延时250 ns处达到最大,250 ns后随着延迟时间的增加减小,电子密度和电子温度在延时1000 ns内快速衰减,1000 ns后衰减速度变慢. Laser-induced Ti plasma emission spectra were observed using a 1064 nm, 10 ns pulsed Nd: YAG laser focused Ti target in air. The laser energy was adjusted to 45 mJ / pulse and the time range from 0 to 4000 ns The time-resolved emission spectrum and spectral profile and broadening.Under the condition of local thermodynamic equilibrium (LTE), the electron temperature was fitted by Saha-boltzmann diagram, the electron density was calculated by the Saha equation, and the relationship between plasma electron temperature and electron density with time The results show that the intensity of the line reaches its maximum at 250 ns after 250 ns and decreases with the increase of the delay time after 250 ns. The electron density and electron temperature are delayed by 1000 ns Fast decay within, slows decay after 1000 ns.