Theoretical study on signal enhancement of orthogonal double pulse induced plasma

Wang, Junxiao; Wang, Gang; Zhang, Lei; Wang, Shuqing; Zhang, Wanfei; Ma, Xiaofei; Liu, Zhenrong; Luo, Xuebin; Ma, Weiguang; Ye, Zefu; Zhu, Zhujun; Yin, Wangbao; Jia, Suotang

doi:10.1039/d2ja00105e

Cited by 5 publications

(2 citation statements)

References 41 publications

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“…In addition to experimental studies, extensive theoretical research has been conducted on DP-LIBS. De Giacomo et al simulated underwater DP-LIBS by combining bubble dynamic codes and Euler equations describing plasma evolution [22]. They pointed out that adjusting the pulse interval can not only change the signal intensity, but can also affect the internal conditions (radius, pressure, and temperature) of the bubble induced by the first pulse, thus influencing the second pulse-induced plasma.…”

Section: Introductionmentioning

confidence: 99%

A theoretical study of the signal enhancement mechanism of coaxial DP-LIBS

SONG 宋,

WANG 王,

WANG 王

et al. 2024

Plasma Sci. Technol.

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In the field of dual-pulse laser-induced breakdown spectroscopy (DP-LIBS) research, the pursuit for determining pulse interval and other parameters quickly and conveniently in order to achieve optimal spectral signal enhancement is paramount. To aid researchers in identifying the optimal signal enhancement conditions and more accurately interpreting the underlying signal enhancement mechanisms, theoretical simulations of the spatiotemporal processes of coaxial DP-LIBS plasma inducing have been established in this work. By means of a model based on laser ablation and two-dimensional axisymmetric fluid dynamics, plasma evolution during aluminum-magnesium alloy laser ablation under single pulse and coaxial dual pulse excitations have been simulated. The influence of factors such as delay time, laser fluence, plasma temperature, particle number density, etc., on the DP-LIBS spectral signals are investigated. Under pulse intervals ranging from 50 to 1500 ns, the time evolution of spectral line intensity, dual-pulse emission enhancement relative to the single-pulse results, laser irradiance, spatial distribution of plasma temperature and species number density, as well as laser irradiance shielded by plasma have been obtained. The study indicates that the main reason behind the radiation signal enhancement in coaxial DP-LIBS induced plasma is attributed to increased species number density and plasma temperature caused by the second laser, and it is inferred that the shielding effect of the plasma mainly occurs in the boundary layer of the stagnation point flow over the target surface. This research provides a theoretical basis for experimental research, parameter optimization, and signal enhancement tracing in DP-LIBS.

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Section: Introductionmentioning

confidence: 99%

A theoretical study of the signal enhancement mechanism of coaxial DP-LIBS

SONG 宋,

WANG 王,

WANG 王

et al. 2024

Plasma Sci. Technol.

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“…Taking laser-induced plasma phenomenon as an example, when focusing on the heating and ablation process, one may choose a microscopic model which utilizes Boltzmann transport equation to investigate the transport of electrons and the electron-lattice interactions; 25 when focusing on the laser-induced plasma expansion process, one may choose a macroscopic model which regards the plasma plume as fluid based on hydrodynamic models. 26 Thirdly, theoretical simulation can avoid the inherent systematic errors of measuring devices, so that one may achieve theoretically accurate results. Therefore, as a complement to experimental measurement, theoretical simulation is an important means to explore the laws and mechanisms of the multifarious LMI phenomena.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Heat Conduction in Laser Ablation Based on Optimal Weight Factor

2023

At.Spectrosc.

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Laser ablation is a crucial process in many types of laser-matter interactions. Therefore, an accurate simulation of the laser ablation is beneficial to understanding the underlying physics in those interaction dynamics. Laser ablation simulation essentially depends on the numerical solution of heat conduction equations, usually based on finite difference strategy. Common finite difference methods include forward-Euler, backward-Euler and Crank-Nicolson schemes, corresponding to three specific finite-difference weight factors, i.e. 0, 1, and 0.5. This study proposes a new method based on an optimal weight factor, which is not a fixed value but pertinently searched for each specific problem. Taking the temporal evolution of a one-dimensional temperature field as an example, we have demonstrated that utilizing the achieved optimal weight factor can yield significantly higher accuracy than using the routine weight factors. The results in this study have the potential to better understand the heat conduction dynamics and the laser ablation physics, and hence improve the performance of relevant LMI-based techniques in the future.

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Review on laser-induced breakdown spectroscopy: methodology and technical developments

Thomas

Joshi

2023

Applied Spectroscopy Reviews

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Theoretical study on signal enhancement of orthogonal double pulse induced plasma

Abstract: The double pulse technology increases the energy transmission between the plasma plume and the target by coupling the laser beam, which greatly enhances the signal, reduces the detection limit of...

Cited by 5 publications

References 41 publications

A theoretical study of the signal enhancement mechanism of coaxial DP-LIBS

A theoretical study of the signal enhancement mechanism of coaxial DP-LIBS

Numerical Simulation of Heat Conduction in Laser Ablation Based on Optimal Weight Factor

Review on laser-induced breakdown spectroscopy: methodology and technical developments

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