Evolution of shock waves formed by laser-induced breakdown in air
Zhang Yi(张翼)a), Li Yu-Tong(李玉同)a), Zheng Zhi-Yuan(郑志远)a)b), Liu Feng(刘峰)a), Zhong Jia-Yong(仲佳勇)a), Lin Xiao Xuan(林晓暄)a), Liu Feng(刘峰)a), Lu Xin(鲁欣)a), and Zhang Jie(张杰)a)†
a Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; b School of Materials Science and Technology, China University of Geosciences, Beijing 100083, China
Abstract The evolution of shock waves produced by 7 ns laser pulses in air is investigated by time-resolved shadowgraph. A nodular structure of the shock wave is observed. It is found that the origin of the structure is the multi-longitudinal-microfocus caused by the astigmatism of the laser beam. The spherical shock waves formed by each microfocus expand gradually and collide with each other, resulting in the nodular structure of the shock wave.
Fund: Project supported by the National
Natural Science Foundation of China (Grant Nos 10510490, 10675164,
10634020, 60478047 and 60621063) and National Basic Research Program
of China (973 Program) (Grant No 2007CB815102).
Cite this article:
Zhang Yi(张翼), Li Yu-Tong(李玉同), Zheng Zhi-Yuan(郑志远), Liu Feng(刘峰), Zhong Jia-Yong(仲佳勇), Lin Xiao Xuan(林晓暄), Liu Feng(刘峰), Lu Xin(鲁欣), and Zhang Jie(张杰) Evolution of shock waves formed by laser-induced breakdown in air 2007 Chinese Physics 16 3728
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