Measurement of electronic temperature of laser-induced plasma channels at various pressures in argon by relative intensities of spectral lines

Abstract

In this paper, we study the properties of laser-induced plasma channels formed by femtosecond laser radiation in argon. The electron temperature of the plasma channels is calculated by the method of relative intensities of spectral lines.

Laser-induced breakdown spectroscopy monitoring of aluminum alloys laser cleaning process

“…The calculation of emission spectra in this tool is carried out using the Saha equation, which is valid for the state of thermodynamic equilibrium of the studied plasma (Saha-LTE). Evaluation of the plasma temperature and the concentration of electrons obtained as a result of laser action on the treated surface was carried out by analyzing the relative intensity of spectral lines similar to the method presented in [17][18][19]. The recorded spectral signals correspond to the excited state of the substance (ion I), according to the data [20].…”