Journal
OPTICS EXPRESS
Volume 23, Issue 21, Pages 27113-27122Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.027113
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Funding
- DOE/NNSA Office of Nonproliferation and Verification Research and Development [NA-22]
- U.S. Department of Energy [DE-AC05-76RL01830]
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Ultrafast laser filament induced breakdown spectroscopy is a very promising method for remote material detection. We present characteristics of plasmas generated in a metal target by laser filaments in air. Our measurements show that the temperature of the ablation plasma is clamped along the filament channel due to intensity clamping in a filament. Nevertheless, significant changes in radiation intensity are noticeable, and this is essentially due to variation in the number density of emitting atoms. The present results also explain the near absence of ion emission but strong atomic neutral emission from plumes produced during fs LIBS in air. (C) 2015 Optical Society of America
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