In this paper, we provide the laser-induced breakdown spectroscopic (LIBS) analysis of copper under the action of the ultrafast picosecond Nd:YAG laser and the specifications calculated from the electron temperature of plasma generated by the fundamental (1064 nm), second (532 nm), third (355 nm), and fourth (266 nm) laser harmonics. In this work, a laser pulse energy of 60 mJ±5% with a duration of 170 ps, a beam diameter of ∼0.5±0.1 mm, and a laser intensity 1.79∙10¹¹ W/cm² ±8% for a single shot was applied. The electron temperature is measured using three spectral lines of neutral copper (Cu I) at 515.3, 521.8, and 522.0 nm, according to the Boltzmann plot model where the local thermodynamic equilibrium (LTE) conditions were assumed. The electron temperature values observed are 13422, 15152, 16605, and 17783K for laser wavelengths of 266, 355, 532, and 1064 nm, respectively. The experimental analysis reveals that the plasma electron temperature rises with the laser wavelength. Variations in the mass ablation rate, inverse Bremsstrahlung absorption, and photoionization with the laser wavelength variation allow us to explore the interaction dynamics. The results obtained allow for variation of the generated plasma electron temperature by guiding the picosecond pulse wavelengths; the later may allow for controlling plasma interactions, which can be applied in plasma spectroscopy of material science.

本文提供了超快皮秒Nd：YAG激光作用下铜的激光诱导击穿光谱（LIBS）分析，以及根据基波（1064 nm），秒（ 532 nm），三次（355 nm）和第四次（266 nm）激光谐波。在这项工作中，激光脉冲能量为60 mJ±5％，持续时间为170 ps，光束直径约为0 。5±0 。1毫米，激光强度1 。79∙10 ¹¹ W / cm ²单次使用±8％。根据假设局部热力学平衡（LTE）条件的玻尔兹曼图模型，使用中性铜（Cu I）的三个光谱线在515.3、521.8和522.0 nm处测量电子温度。对于266、355、532和1064 nm的激光波长，观察到的电子温度值分别为13422、15152、16605和17783K。实验分析表明，等离子体电子温度随激光波长而升高。质量消融率，Bre致辐射的逆吸收和光电离随激光波长变化的变化使我们能够探索相互作用的动力学。通过引导皮秒脉冲的波长，获得的结果可以改变产生的等离子体电子温度。