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60 fs长脉宽双色场作用下孤立阿秒脉冲的产生
引用本文: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):143201-143201.
作者姓名:刘胜男  陈高  孟健
作者单位:长春理工大学,长春,130022
基金项目:国家自然科学基金(批准号: 10604021)资助的课题.
摘    要:通过数值求解一维含时Schrödinger方程,研究了具有较长脉宽双色激光脉冲与氢原子相互作用产生的高次谐波和阿秒(as)脉冲.这里的双色激光脉冲由一束基频钛宝石主脉冲与另一束红外附加脉冲构成.研究发现,当合成脉冲的脉宽选为12 fs时, 选取合适的附加脉冲波长,合成电场的振幅在始末端时间段能被大幅抑制, 仅中间部分的电场对谐波谱平台区和截止位置起主要贡献. 通过分析合成脉冲电场始末端时间段抑制的机理,进一步扩展了合成脉冲脉宽到60 as, 并得到160 as的孤立短脉冲.这是迄今为止在孤立阿秒脉冲产生研究中所采用的最长脉宽. 该方案中的合成脉冲等效于单一5 fs短脉冲的作用, 却克服了5 fs脉冲低输出能量导致的阿秒脉冲能量低的困难.

关 键 词:高次谐波  孤立阿秒脉冲  长脉宽组合脉冲
收稿时间:2011-09-30

Generation of isolated attosecond pulse from two-color pulse with duration of 60 fs
Liu Sheng-Nan,Chen Gao,Meng Jian.Generation of isolated attosecond pulse from two-color pulse with duration of 60 fs[J].Acta Physica Sinica,2012,61(14):143201-143201.
Authors:Liu Sheng-Nan  Chen Gao  Meng Jian
Affiliation:College of Science, Changchun University of Science and Technology, Changchun 130022, China
Abstract:We theoretically investigate the high-order harmonic and attosecond pulse generation by numerically solving the one-dimensional time-dependent Schrödinger 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.
Keywords:high harmonic generation  single attosecond pulse  multicycle synthesized pulse
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