Numerical simulation of laser-induced plasma in background gas considering multiple interaction processes

Wang, Junxiao; Zhang, Lei; Wang, Shuqing; Su, Maogen; Sun, Duixiong; Han, Jianghua; Xia, Guofu; Dong, Chenzhong; Qin, Min; Ma, Weiguang; Dong, Lei; Yin, Wangbao; Xiao, Liantuan; Jia, Suotang

doi:10.1088/2058-6272/abdda3

Cited by 3 publications

(1 citation statement)

References 32 publications

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“…Plasma parameters include species number density, plasma temperature and so on. The expansion of laser ablated plasma is usually described by the multi-species hydrodynamics model, including the conservation equations of mass, momentum and energy [25][26][27][28]:…”

Section: Calculation Of Plasma Parametersmentioning

confidence: 99%

Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum–magnesium alloy

Wang¹,

Wang²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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We proposed a theoretical spatio-temporal imaging method, which was based on the thermal model of laser ablation and the two-dimensional axisymmetric multi-species hydrodynamics model. By using the intensity formula, the integral intensity of spectral lines could be calculated and the corresponding images of intensity distribution could be drawn. Through further image processing such as normalization, determination of minimum intensity, combination and color filtering, a relatively clear species distribution image in the plasma could be obtained. Using the above method, we simulated the plasma ablated from Al-Mg alloy by different laser energies under 1 atm argon, and obtained the theoretical spatio-temporal distributions of Mg I, Mg II, Al I, Al II and Ar I species, which are almost consistent with the experimental results by differential imaging. Compared with the experimental decay time constants, the consistency is higher at low laser energy, indicating that our theoretical model is more suitable for the plasma dominated by laser-supported combustion wave.

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Section: Calculation Of Plasma Parametersmentioning

confidence: 99%

Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum–magnesium alloy

Wang¹,

Wang²,

Zhang³

et al. 2022

Plasma Sci. Technol.

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Study on the radiation and self-absorption characteristics of plasma under various background gases

wang¹,

Liu²,

zhu³

et al. 2023

Opt. Express

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The self-absorption effect is a primary factor responsible for the decline in the precision of quantitative analysis techniques using plasma emission spectroscopy, such as laser-induced breakdown spectroscopy (LIBS). In this study, based on the thermal ablation and hydrodynamics models, the radiation characteristics and self-absorption of laser-induced plasmas under different background gases were theoretically simulated and experimentally verified to investigate ways of weakening the self-absorption effect in plasma. The results reveal that the plasma temperature and density increase with higher molecular weight and pressure of the background gas, leading to stronger species emission line intensity. To reduce the self-absorption effect in the later stages of plasma evolution, we can decrease the gas pressure or substitute the background gas with a lower molecular weight. As the excitation energy of the species increases, the impact of the background gas type on the spectral line intensity becomes more pronounced. Moreover, we accurately calculated the optically thin moments under various conditions using theoretical models, which are consistent with the experimental results. From the temporal evolution of the doublet intensity ratio of species, it is deduced that the optically thin moment appears later with higher molecular weight and pressure of the background gas and lower upper energy of the species. This theoretical research is essential in selecting the appropriate background gas type and pressure and doublets in self-absorption-free LIBS (SAF-LIBS) experiments to weaken the self-absorption effect.

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Kinetic Evolution of Laser Ablating Alloy Materials

Wang¹,

Zhang²,

Wang³

et al. 2021

Front. Phys.

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Through the theoretical simulation and analysis of the whole process of laser ablating target and producing plasma with high spatio-temporal resolution, it is helpful for people to gain a more complete understanding of the ablation process of target and the evolution process of plasma parameters, which has an important guiding role for the improvement and optimization of laser ablation technology. Alloys are commonly used in daily life, but there are few researches on laser-induced alloy targets at present. Therefore, based on the thermal model of laser ablation and the two-dimensional axisymmetric multi-species hydrodynamic model, the process of laser ablating Al-Mg alloy under atmospheric pressure argon is theoretically simulated, and the ablation process of alloy target and the spatio-temporal evolution results of plasma parameters under different laser irradiances are compared. At high laser irradiance, the melt and evaporation depth, laser energy absorption and plasma characterization parameters are much greater than those at low laser irradiance, and the species energy distribution at different laser irradiance also presents different trends. In addition, the velocity of different species is calculated according to the position-time diagram of the maximum emission intensity, and they expand at a constant speed during the studied time. These results can provide some theoretical guidance for the early application of laser-induced breakdown spectroscopy in metallurgy.

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Numerical simulation of laser-induced plasma in background gas considering multiple interaction processes

Cited by 3 publications

References 32 publications

Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum–magnesium alloy

Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum–magnesium alloy

Study on the radiation and self-absorption characteristics of plasma under various background gases

Kinetic Evolution of Laser Ablating Alloy Materials

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