Journal
APPLIED PHYSICS LETTERS
Volume 112, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5009062
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Funding
- National Natural Science Foundation of China (NSFC) [91323301, 51605029, 11704028]
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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. Published by AIP Publishing.
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