Journal
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
Volume 64, Issue 1, Pages 56-66Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.sab.2008.10.037
Keywords
LIBS; Plasma shielding; Laser ablation; Plasma diagnostics; Plasma imaging
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The influence of laser irradiance on the extent of laser-sample coupling at 1064 nm was investigated in argon, air and helium at atmospheric pressure. Focused shadowgraphy measurements allowed the observation of laser-matter interaction at the nanosecond timescale and to visualize different behaviors in argon, air and helium atmospheres. It was established using shadowgraphy and laser drilling experiments that the growth of ablation rate with laser irradiance changes drastically depending on the irradiance range considered. In addition, laser-induced gas breakdown and laser-supported detonation processes, which have different origins but may both lead to decreased coupling via plasma shielding, could clearly be distinguished. (C) 2008 Elsevier B.V. All rights reserved.
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