Optical diagnostics of femtosecond laser plasmas |
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Authors: | LI Yutong ZHANG Jie CHEN Liming XIA Jiangfan TENG Hao ZHAO Lizeng LIN Jingquan Li Yingjun WEI Zhiyi WANG Long JIANG Wenmian |
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Affiliation: | 1. Institute of Physics, Chinese Academy of Sciences,;Research Center of Laser Fusion Academy of Engineering Physics, 2. Institute of Physics, Chinese Academy of Sciences, 3. Research Center of Laser Fusion Academy of Engineering Physics, |
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Abstract: | Optical diagnostics of evolution of plasmas produced by ultrashort laser pulses is carried out using a femtosecond probing beam. The time sequence of plasma shadowgrams and interferograms are obtained. The filamentation instability in high-density region induces the local density modification. Large-scale toroidal magnetic fields confine plasma expansion in the transverse direction, resulting in the formation of a plasma jet. The plasma expansion along the target normal direction is found to scale as t1/2. |
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Keywords: | Femtosecond laser plasma Optical diagnostic Electron density gradient |
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