Abstract
In this paper, we use laser-induced breakdown spectroscopy (LIBS) to investigate the laser-induced copper plasma with and without an external magnetic field, applying different laser energies. Confining the optical emission during plasma expansions affects LIBS signals obtained. Laser-induced plasma on the copper surface is generated by focusing an Nd:YAG laser beam (1064 nm, 6 ns), with laser energy varying about 30 – 150 mJ. In our study, we show a considerable LIBS-signal enhancement in the presence of a 1.12 T magnetic field compared with the absence of that, especially for laser energies of E < 155 mJ, due to an increase in the plasma electron density and electron–ion recombination rate effectively through magnetically-confined plasma. However, in the case of E = 155 mJ energy, the LIBS signal decreases in the presence of magnetic fields due to alternative increase in the plasma density in the self-absorption rate in the plasma plume due to the magnetic force. We consider the laser beam energy of E = 30 mJ as an optimum laser energy. Also we study the temporal evolution of the optical emission intensity in the presence and absence of the magnetic field for the lowest (E = 30 mJ) and the highest (E = 155 mJ) laser beam energies.
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Babae, R., Ghezelbash, M., Majd, A.E. et al. Simultaneous Investigation of the Laser Intensity and Magnetic Field Effects on Laser-Induced Plasma Spectroscopy. J Russ Laser Res 43, 162–168 (2022). https://doi.org/10.1007/s10946-022-10033-6
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DOI: https://doi.org/10.1007/s10946-022-10033-6