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.

Junxiao WANG;Shuqing WANG;Lei ZHANG;Maogen SU;Duixiong SUN;Qi MIN;Weiguang MA;Wangbao YIN;Suotang JIA

State Key Laboratory of Quantum Optics and Quantum Optics Devices,Institute of Laser Spectroscopy,Shanxi University,Taiyuan 030006,People's Republic of China;Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,People's Republic of China;National Energy R&D Center of Petroleum Refining Technology(RIPP,SINOPEC),Beijing 100728,People's Republic of China;Key Laboratory of Atomic and Molecular Physics&Functional Material of Gansu Province,College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,People's Republic of China

等离子体科学和技术（英文版）

[1]Junxiao WANG;Shuqing WANG;Lei ZHANG;Maogen SU;Duixiong SUN;Qi MIN;Weiguang MA;Wangbao YIN;Suotang JIA-.Measurement and analysis of species distribution in laser-induced ablation plasma of an aluminum-magnesium alloy)[J].等离子体科学和技术（英文版）,2022(03):51-60

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