Propagation Regimes and Signal Enhancement Mechanisms of Collinear Double-Pulse Plasma with Varying Inter-Pulse Delays.

Yang Zhao, Lei Zhang, Zhihui Tian, Xiuqing Zhang, Jiandong Bai, Wangbao Yin

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Article in Sensors (Basel, Switzerland), 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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6 authors.

Yang ZhaoSchool of Semiconductor and Physics, North University of China, Taiyuan 030051, China.

Lei ZhangState Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.

Zhihui TianSchool of Physics and Electronic Information Engineering, Hubei Engineering University, Xiaogan 432000, China.

Xiuqing ZhangSchool of Semiconductor and Physics, North University of China, Taiyuan 030051, China.

Jiandong BaiSchool of Semiconductor and Physics, North University of China, Taiyuan 030051, China.ORCID 0000-0001-8760-8171

Wangbao YinState Key Laboratory of Quantum Optics Technologies and Devices, Institute of Laser Spectroscopy, Shanxi University, Taiyuan 030006, China.

Funding

111 Project D18001Central Guidance on Local Science and Technology Development Fund of Shanxi Province YDZJSX2024C010Fundamental Research Program of Shanxi Province 202203021212122, 20210302124161 and 202103021223210Fund for Shanxi "1331KSC"National Energy R&D Center of Petroleum Refining Technology RIPP, SINOPECNational Natural Science Foundation of China 12404467, 12374377, 12104417, 62471443, 61975103 and 627010407Scientific Research Program of Hubei Provincial Department of Education B2023162

6 · The paper itself

Abstract

Laser-induced breakdown spectroscopy (LIBS) is an in situ analytical technique. Compared to traditional single-pulse LIBS (SP-LIBS), collinear double-pulse LIBS (DP-LIBS) is a promising technique due to its lower limit of detection for trace elements. In this paper, we analyze the spectral and image information obtained from the emissions emitted by single/double pulse (SP/DP) laser-induced plasmas. The types of laser-supported absorption (LSA) waves of the plasmas were determined according to the interactions among the ablation vapor, the ambient gas, and the laser. Furthermore, the influence mechanisms of plasma shielding on DP-LIBS signal intensity enhancement with different inter-pulse delay were investigated. In our experimental conditions, the propagation regime of SP plasma is a laser-supported combustion (LSC) wave. The DP plasmas with short inter-pulse delays show the characteristics of a laser-supported detonation (LSD) wave, and the enhancement mechanism is mainly reheating for pre-plasma. On the contrary, the DP plasmas with longer inter-pulse delays show the characteristics of a LSC wave, and the increase in laser ablation is a major contributing factor to the signal improvement. In addition, the spectral lines, which are difficult to excite by SP-LIBS, can be obtained by selecting an appropriate inter-pulse delay and setting a short delay, which provides a new idea for the measurement of trace elements.

Indexed as

collinear double-pulse laser-induced breakdown spectroscopy (DP-LIBS)collinear double-pulse laser-induced plasmalaser-supported absorption (LSA) wavesignal enhancement mechanisms

Identifiers

PMID40968988

DOI10.3390/s25113409

PMCPMC12158238

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