Temporal-spatial measurement of electron relaxation time in femtosecond laser induced plasma using two-color pump-probe imaging technique

Changji Pan, Lan Jiang, Qingsong Wang, Jingya Sun, Guoyan Wang, Yongfeng Lu

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The femtosecond (fs) laser is a powerful tool to study ultrafast plasma dynamics, especially electron relaxation in strong ionization of dielectrics. Herein, temporal-spatial evolution of femtosecond laser induced plasma in fused silica was investigated using a two-color pump-probe technique (i.e., 400 nm and 800 nm, respectively). We demonstrated that when ionized electron density is lower than the critical density, free electron relaxation time is inversely proportional to electron density, which can be explained by the electron-ion scattering regime. In addition, electron density evolution within plasma was analyzed in an early stage (first 800 fs) of the laser-material interaction.

Original languageEnglish (US)
Article number191101
JournalApplied Physics Letters
Issue number19
StatePublished - May 7 2018


ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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