Journal
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
Volume 112, Issue 1, Pages 215-219Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00339-012-7282-y
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Funding
- ISRO-IITM Technology Cell
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A novel approach of dual-wavelength LIBS with a single Nd3+:YAG laser is proposed and demonstrated for lunar-simulant analysis in high vacuum conditions. Laser ablation was performed at 355 nm/532 nm wavelength, and subsequently, the plasma was reexcited with the fundamental (1064 nm) wavelength. The interpulse delay was adjusted by varying the optical path length. A significant line intensity enhancement up to a factor of 3 was observed for many of the dominant emission lines of the lunar simulant sample. A theoretical model for understanding the mechanism behind the intensity improvements of dual-wavelength configurations is also discussed. Experimentally observed plasma temperature was comparable with theoretically estimated plasma temperature of silicon, which is the major constituent of lunar simulant.
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