Investigation of thermodynamic properties in picosecond laser-produced plasmas on silicon
Source abstract
Abstract
The validity of local thermodynamic equilibrium (LTE) in plasma is a long-term concern for laser-induced breakdown spectroscopy applications. In this paper, the spatial and temporal dependence of LTE deviation in picosecond laser-induced plasmas has been proved. A picosecond (∼20 ps) laser operated at 532 nm was used to ablate a silicon target to produce plasma at a pressure of 10−5 mbar. A general electron energy distribution function was used to provide access to the insight into population ratios of different energy levels for the spatially and temporally resolved optical emission intensity of laser-induced plasma. A precise temporal and spatial LTE boundary of plasma generated in picosecond laser ablation was obtained, and the results showed that only at delay times of 180–300 ns, the plasma away from the surface (>4 mm) is in LTE.
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Research context
OpenAlex topics: Laser-induced spectroscopy and plasma · Analytical chemistry methods development · Mercury impact and mitigation studies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
College of Advanced Interdisciplinary Studies, National University of Defense Technology 1 , Changsha 410073, China
Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology 2 , Changsha 410073, China
Nanhu Laser Laboratory, National University of Defense Technology 3 , Changsha 410073, China
Funding
National Natural Science Foundation of China · Science and Technology Innovation Program
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