Influence of the laser parameters on the space and time characteristics of an aluminum laser-induced plasma |
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| Affiliation: | 1. Chemistry Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States;2. Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States;3. Department of Chemistry, Radiochemistry Program, University of Nevada, Las Vegas, Nevada 89154, United States;1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;2. Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy (Jilin University), Changchun 130012, China;3. State Key Laboratory of Laser Propulsion & Application, Academy of Equipment, Beijing 101416, China;1. Key Laboratory of Atomic and Molecular Physics & Functional Material of Gansu Province, College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou, 730070, China;2. Joint Laboratory of Atomic and Molecular Physics, Northwest Normal University and Institute of Modern Physics of Chinese Academy of Sciences, Lanzhou 730070, China;1. State Key Lab of Power Systems, International Joint Laboratory on Low Carbon Clean Energy Innovation, Department of Energy and Power Engineering, Tsinghua University, Beijing 100084, China;2. Shanxi Research Institute for Clean Energy, Tsinghua University, Taiyuan 030032, China;3. School of Electronics, Electrical Engineering and Computer Science, Queen''s University Belfast, Belfast BT9 5BN, UK;4. Renewable Energy Resources Lab (RERL), Department of Mechanical and Aerospace Engineering, The University of California, Irvine, CA 92697-3975, United States |
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| Abstract: | In this work, an aluminum laser plasma produced in ambient air at atmospheric pressure by laser pulses at a fluence of 10 J/cm2 is characterized by time- and space-resolved measurements of electron density and temperature. Varying the laser pulse duration from 6 ns to 80 fs and the laser wavelength from ultraviolet to infrared only slightly influences the plasma properties. The temperature exhibits a slight decrease both at the plasma edge and close to the target surface. The electron density is found to be spatially homogeneous in the ablation plume during the first microsecond. Finally, the plasma expansion is in good agreement with the Sedov's model during the first 500 ns and it becomes subsonic, with respect to the velocity of sound in air, typically 1 μs after the plasma creation. The physical interpretation of the experimental results is also discussed to the light of a one-dimensional fluid model which provides a good qualitative agreement with measurements. |
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