物理学报2012，Vol.61Issue(14)：144-150,7.
60 fs长脉宽双色场作用下孤立阿秒脉冲的产生
Generation of isolated attosecond pulse from two-color pulse with duration of 60 fs
摘要
Abstract
We theoretically investigate the high-order harmonic and attosecond pulse generation by numerically solving the one-dimensional time-dependent Schrdinger equation from a hydrogen atom in a two-color laser field,which is synthesized by adding a suitable multicycle infrared pulse to a multicycle 800 nm fundamental pulse.Our results clearly show that when there are 12 Ti：sapphire optical cycles in the pulse envelope,by adding a suitable second optical field,the electric field of the synthesized pulse presents three- segments,and only amplitude of the electric field in middle segment makes a major contribution to the plateau and cutoff region of the harmonic spectrum.By analyzing the compression mechanism of two-color electric field,we further enlarge the duration of the synthesized pulse to 60 fs,and obtain a single 160 as short pulse.This has been the longest pulse duration used for obtaining single attosecond pulse so far.Here the effect of synthesized pulses is similar to the effect of single 5 fs ultrashort pulse.This scheme greatly reduces the requirements for the pump laser system used traditionally for generating an isolated attosecond pulse,and it allows us to use a well-established conventional high-power pumping laser.关键词
高次谐波/孤立阿秒脉冲/长脉宽组合脉冲Key words
high harmonic generation/single attosecond pulse/multicycle synthesized pulse分类
信息技术与安全科学引用本文复制引用
刘胜男,陈高,孟健..60 fs长脉宽双色场作用下孤立阿秒脉冲的产生[J].物理学报,2012,61(14):144-150,7.基金项目
国家自然科学基金（批准号：10604021）资助的课题~~ （）
