Spectra and structures of near-surface plasma torches were studied experimentally by measuring the specific mass loss and plume luminosity caused by dual-pulse laser radiation at wavelengths 1064 and 532 nm on titanium in air as functions of the time between laser pulses and their sequence. Dependences of the laser-plasma temperature and concentration of charged particles on the paired laser pulse parameters were established at laser radiation power densities q1064 ≤ 3.1·109 and q532 ≤ 2.7·109 W/cm2 for λ = 1064 and 532 nm. The optimal conditions for recording erosion plasma spectra had the initial effect from second-harmonic radiation with a time interval between pulses of 4–5 μs; for specific mass loss, 3–6 μs. The results were important for enhancing the efficiency of laser emission spectral analysis and laser-plasma processing of materials.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 86, No. 5, pp. 751–759, September–October, 2019.
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Chumakov, A.N., Bosak, N.A. & Ivanov, A.A. Near-Surface Plasma Formed by Dual-Pulse Laser Action at Two Wavelengths on Titanium in Air. J Appl Spectrosc 86, 836–842 (2019). https://doi.org/10.1007/s10812-019-00903-4
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DOI: https://doi.org/10.1007/s10812-019-00903-4