Periodic variations of plasma optical emission during repetitive pulsed-laser irradiation of aluminum in ambient air |
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| Authors: | L St-Onge V Detalle M Sabsabi |
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| Institution: | (1) National Research Council Canada, Industrial Materials Institute, 75 de Mortagne Blvd., Boucherville , Québec, J4B 6Y4, Canada |
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| Abstract: | Optical emission from plasma produced in ambient air by focusing a Nd:YAG laser beam on an aluminum surface was spectrally analysed. A periodic behaviour was observed in spectral line intensities associated with series of laser pulses. Based on simultaneous measurements of diffuse surface reflectivity and complementary measurements in other gases (He, O2, N2), this behaviour is ascribed to a competition between thermally-assisted surface oxidation and nitridation, and laser ablation. PACS 52.38.Mf; 52.50.Jm; 81.65; 78.68.+m; 52.70.Kz |
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