In this paper, we investigated the emission spectra of plasmas produced from femtosecond and nanosecond laser ablations at different target temperatures in air. A brass was selected as ablated target of the experiment. The results indicated that spectral emission intensity and plasma temperature showed similar trend for femtosecond and nanosecond lasers, and the two parameters were improved by increasing the sample temperature in both cases. Moreover, the temperature of nanosecond laser-excited plasma was higher compared with that of femtosecond laser-excited plasma, and the increase of the plasma temperature in the case of nanosecond laser was more evident. In addition, there was a significant difference in electron density between femtosecond and nanosecond laser-induced plasmas. The electron density for femtosecond laser decreased with increasing the target temperature, while for nanosecond laser, the electron density was almost unchanged at different sample temperatures.

在本文中，我们研究了飞秒和纳秒激光烧蚀在空气中不同目标温度下产生的等离子体的发射光谱。选择黄铜作为实验的烧蚀目标。结果表明，飞秒和纳秒激光器的光谱发射强度和等离子体温度表现出相似的趋势，并且在两种情况下都通过提高样品温度来改善这两个参数。此外，纳秒激光激发等离子体的温度高于飞秒激光激发等离子体的温度，并且在纳秒激光的情况下等离子体温度的升高更为明显。此外，飞秒和纳秒激光诱导等离子体之间的电子密度存在显着差异。