Yang Weifeng, Song Xiaohong, Zeng Zhinan, Li Ruxin, Xu Zhizhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China.
Opt Express. 2010 Feb 1;18(3):2558-65. doi: 10.1364/OE.18.002558.
We report a new quantum path interference effect of electron trajectories in high-order harmonic generation (HHG) from two-center molecules, in which the interference minima are mainly located in the high-energy portion of HHG spectrum. The quantum calculations of the time-frequency analyses and the classical results of the electron trajectories demonstrate very good agreement and reveal that the positions of the interference minima are associated with the cutoff of various kinds of molecular electron trajectories. The interference fringes within a half optical cycle can be clearly seen in the time-frequency analysis spectrum. Moreover, the characteristics of both the HHG in frequency domain and the corresponding attosecond pulse generation in time domain permit tracing back the interference information of these electron trajectories. These interference phenomena offer new possibilities for getting insight into the attosecond electronic dynamics in molecules.
我们报道了双中心分子高次谐波产生（HHG）中电子轨迹的一种新的量子路径干涉效应，其中干涉极小值主要位于HHG光谱的高能部分。时频分析的量子计算和电子轨迹的经典结果显示出非常好的一致性，并揭示干涉极小值的位置与各种分子电子轨迹的截止有关。在时频分析光谱中可以清楚地看到半个光学周期内的干涉条纹。此外，频域中的HHG特性和时域中相应的阿秒脉冲产生特性都能够追溯这些电子轨迹的干涉信息。这些干涉现象为深入了解分子中的阿秒电子动力学提供了新的可能性。
