The spatial distribution in high-order harmonic generation of H-2(+) with different time delays of the two-color laser fields
The spatial distribution in high-order harmonic generation of H-2(+) with different time delays of the two-color laser fields
复制标题
双色激光场不同时滞时H-2( )高次谐波产生的空间分布
DOI：
10.1016/j.optcom.2016.08.040
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发表时间：
2017
影响因子：
2.4
通讯作者：
Liu Xue-Shen
中科院分区：
文献类型：
--
作者：
Zhang Jun;Pan Xue-Fei;Du Hui;Xu Tong-Tong;Guo Jing;Liu Xue-Shen
通过引入由中红外和近红外激光场组成的延时双色激光场，从理论上研究了h2 +分子的高次谐波产生及其在高次谐波中的空间分布。双色激光场在不同的时间延迟下，脉冲形状发生改变，导致与原子核复合的电子沿正负z方向发生变化。当时间延迟为0 fs （1.34 fs）时，电子与原子核沿负（正）z方向复合形成一个平滑的谐波平台。当时间延迟为1.34秒时，产生一个持续时间约为99秒的孤立阿秒脉冲。我们进行的经典分析与一维非born - oppenheimer时间相关Schrödinger方程（TDSE）的数值结果一致。我们还从时频分析的角度研究了谐波的发射时间，以进一步了解潜在的物理机制。
We theoretically investigate the high-order harmonic generation (HHG) and the spatial distribution in HHG of the H 2+ molecule by introducing a time-delayed two-color laser field which consists of the mid-infrared and near-infrared laser field. For the different time delays of the two-color laser fields, the pulse shapes are changed which result in the variation of the electron recombined with the nuclei along the positive-or negative-z direction. When the time delay is 0 fs (1.34 fs), a smooth harmonic plateau from the electron recombined with the nuclei along the negative (positive)-z direction can be achieved. An isolated attosecond pulse with a duration of about 99 as is generated when the time delay is 1.34 fs. We perform the classical analysis which is consistent with the numerical results from the one-dimensional non-Born-Oppenheimer time dependent Schrödinger equation (TDSE). We also investigate emission time of harmonics in terms of a time-frequency analysis to further understand the underlying physical mechanism.