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

被引：29

作者：

Pan, Changji ^{[1
]}

Jiang, Lan ^{[1
,2
]}

Wang, Qingsong ^{[1
]}

Sun, Jingya ^{[1
]}

Wang, Guoyan ^{[1
]}

Lu, Yongfeng ^{[3
]}

机构：

[1] Beijing Inst Technol, Sch Mech Engn, Laser Micro Nanofabricat Lab, Beijing 100081, Peoples R China

[2] Tsinghua Univ, Dept Mech Engn, Laser Micro Nanofabricat Lab, Beijing 100084, Peoples R China

[3] Univ Nebraska, Dept Elect Engn, Lincoln, NE 68588 USA

来源：

APPLIED PHYSICS LETTERS | 2018年 / 112卷 / 19期

基金：

中国国家自然科学基金;

关键词：

ULTRAFAST ELECTRON; DIELECTRICS; NANOSECOND; BREAKDOWN; DYNAMICS;

D O I：

10.1063/1.5009062

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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.

引用

页数：4

共 26 条

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