Open AccessAnalysis of electron momentum relaxation time in fused silica using a tightly focused femtosecond laser pulse
Author(s) -
Huadong Bian,
Yong Dai,
Junyi Ye,
Juan Song,
Xiaona Yan,
Guohong Ma
Publication year - 2014
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.63.074209
Subject(s) - femtosecond , laser , electron , ionization , relaxation (psychology) , atomic physics , momentum (technical analysis) , pulse (music) , fluence , physics , materials science , optics , ion , quantum mechanics , finance , detector , economics , social psychology , psychology
The electron momentum relaxation time is studied systematically in order to understand its effect during the excited nonlinear ionization process in fused silica with an irradiation of tightly focused femtosecond laser pulses. According to the analysis of a (3+1)-dimensional extended general nonlinear Schrödinger equation, the electron momentum relaxation time shows a huge effect on peak intensity, free electron density, and fluence distributions in the focal region of the incident pulse, meanwhile a value of 1.27 fs is thought to meet the present experimental result based on the theoretical model. Further research indicates that the change of electron momentum relaxation time can have significant difference among several nonlinear mechanisms, such as the laser-induced avalanche ionization, reverse bremsstrahlung, self-defocusing of plasma, etc. Results show that the electron momentum relaxation time plays an important role in the process of femtosecond laser pulses interaction with materials.