Valuation of theoretical and experimental thresholds fluences of pure metals using laser induced plasma spectroscopy (LIPS)

Abstract

Abstract The present studies demonstrate the valuation of threshold fluence of pure metals using the laser-induced plasma spectroscopy technique. The optical emission spectra of the s, p, and d-block elements including Li, Mg, Sr, Ba, Al, Sn, Pb, Cu, Zn, Au, Cd, and Ag were recorded using a Q-switched Nd:YAG laser operating at 532 nm and an Echelle spectrograph (Andor Mechelle M500) equipped with a gated ICCD system. The laser fluence was varied from 0.5 to 15 J cm−2 using a fixed spot size of approximately 1.0 ± 0.1 mm. The threshold fluence was measured using the isolated and well-separated emission lines of all the elements. The experimental threshold fluence values for Li, Ca, Mg, Sr, Ba, Al, Sn, Pb, Cu, Zn, Au, Cd, and Ag were determined as 0.8 J cm−2, 1.4 J cm−2, 1.18 J cm−2, 0.7 J cm−2, 0.4 J cm−2, 2.5 J cm−2, 1.0 J cm−2, 0.7 J cm−2, 3.15 J cm−2, 3.9 J cm−2, 0.8 J cm−2, 3.4 J cm−2, and 0.8 J cm−2 respectively. Theoretical values of the threshold fluences were also determined, showing good agreement with the experimentally measured values.