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SIGNAL ENHANCEMENT AND REPRODUCIBILITY IMPROVEMENT IN DOUBLE-PULSE FEMTOSECOND-LASER-INDUCED BREAKDOWN SPECTROSCOPY
Abstract
A focus depth optimization method was proposed for signal enhancement and reproducibility improvement in pump-probe collinear double-pulse femtosecond laser-induced breakdown spectroscopy. This method was based on the optimization of the focus depth of the second pulse. The spectral signal intensity showed a stable enhancement with an enhancement factor of ~3, and the signal reproducibility exhibited minimal fluctuations when the focus depth of the second pulse was within the range of 0–2 mm below the sample surface. Additionally, the possible mechanisms behind the observed signal enhancement and improvement in reproducibility were discussed based on the measured plasma temperature and electron density.
Keywords
laser-induced breakdown spectroscopy,
double-pulse femtosecond laser-induced breakdown spectroscopy,
signal enhancement,
reproducibility improvement
Supporting agencies: This work was supported by the National Natural Science Foundation of China (Nos. 12102408, 12275258).
About the Authors
Y. Zhu
Institute of Fluid Physics, China Academy of Engineering Physics
China
China
Mianyang
P. Zhou
Institute of Fluid Physics, China Academy of Engineering Physics
China
China
Mianyang
S. Li
Institute of Fluid Physics, China Academy of Engineering Physics
China
China
Mianyang
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Review
For citations:
Zhu Y., Zhou P., Li S. SIGNAL ENHANCEMENT AND REPRODUCIBILITY IMPROVEMENT IN DOUBLE-PULSE FEMTOSECOND-LASER-INDUCED BREAKDOWN SPECTROSCOPY. Zhurnal Prikladnoii Spektroskopii. 2025;92(1):126.
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