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Evolution of shock waves formed by laser-induced breakdown in air |
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| Authors: | Zhang Yi Li Yu-Tong Zheng Zhi-Yuan Liu Feng Zhong Jia-Yong Lin Xiao Xuan Liu Feng Lu Xin and Zhang Jie |
| Institution: | Beijing National Laboratory for Condensed Matter Physics, Institute of Physics,Chinese Academy of Sciences, Beijing 100080, China; 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. |
| Keywords: | shock wave nodular structure astigmatism |
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