The spectral repeatability improvement of nanosecond pulsed laser-induced Al plasma with magnetic field confinement

Abstract

In this study, the spectral repeatability improvement of laser-induced aluminum (Al) plasma with magnetic field confinement was investigated. The experimental results demonstrated that the enhancement factors of Al emission spectra increased by approximately 3.24, 4.68, and 8.44 times at field strengths of 0.1, 0.2, and 0.4T, respectively, compared to the condition without a magnetic field. The electron temperature (T_e) and electron density (N_e) were calculated using the Boltzmann plot method and Stark broadening method, revealing a significant increase in both parameters under the influence of a magnetic field. In addition, shot-to-shot repeatability of the LIBS signal and plasma parameters (T_e & N_e) were studied by calculating the relative standard deviation (RSD), and the results indicated that both terms were significantly decreased with an increase in the field strength value. These findings underline the potential of magnetic confinement for enhancing LIBS performance in practical applications, including material analysis and environmental monitoring.