Nanosecond laser-induced breakdown plasma radiation characteristics

The plasma induced when laser interacts with matter (solid, gas, etc.) can radiate a wide range of electromagnetic waves. Its electromagnetic radiation bands range from extreme ultraviolet, ultraviolet, visible, infrared, terahertz to radio frequency microwave. Radiation in these wavelength bands has a wide range of applications, so it is of great significance to study laser plasma radiation. We studied the characteristics of nanosecond laser (1064nm, 8ns) induced plasma optical radiation. The influence of the laser parameters on the plasma radiation intensity and the time evolution of the radiation were obtained. Furthermore, we the obtained effect of the characteristics of the target on the radiation characteristics of the plasma. Finally, we calculated the electron temperature of the air plasma. The experimental results show that: the linear spectrum in the visible spectrum of laser-induced air plasma is mainly the ion spectrum of nitrogen and oxygen; as the laser energy increases the intensity of visible light radiation of air and Al plasma is gradually increasing; when the delay is 15ns, the spectral line intensity reaches the maximum; as the laser energy increases, the plasma electron temperature increases.