物理学报Issue(7)：074209-1-074209-7,7.DOI:10.7498/aps.63.074209
紧聚焦飞秒脉冲与石英玻璃相互作用过程中的电子动量弛豫时间研究
Analysis of electron momentum relaxation time in fused silica using a tightly fo cused femtosecond laser pulse
摘要
Abstract
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.关键词
飞秒激光/多光子电离/石英玻璃/广义非线性薛定谔方程Key words
femtosecond laser/multiphoton ionization/fused silica/general nonlinear Schrödinger equation引用本文复制引用
卞华栋,戴晔,叶俊毅,宋娟,阎晓娜,马国宏..紧聚焦飞秒脉冲与石英玻璃相互作用过程中的电子动量弛豫时间研究[J].物理学报,2014,(7):074209-1-074209-7,7.基金项目
国家自然科学基金(批准号:60908007,11174159,61205128)和上海市自然科学基金(批准号:13ZR1414800)资助的课题.* Project supported by the National Natural Science Foundation of China (Grant Nos.60908007,11174159,61205128), and the Shanghai Natural Science Foundation, China (Grant No.13ZR1414800) （批准号:60908007,11174159,61205128）
