Liu Candong, Zheng Yinghui, Zeng Zhinan, Liu Peng, Li Ruxin, Xu Zhizhan
State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China.
Opt Express. 2009 Jun 8;17(12):10319-26. doi: 10.1364/oe.17.010319.
We theoretically investigate the quantum-path interference during the high harmonic generation in argon and observe the multi-quantum- path-interference (MQPI) effect related to the chirp of driving laser pulse. We successfully identify the interference originated from four significantly contributing quantum paths in the interaction of "isolated" atom with the driving laser field. Moreover, the MQPI effect is further demonstrated beyond the single atom response by spatial filtering which is used for angle-selective detection of transmitted light when three-dimensional propagation is considered. It implies that the role of high-order electron returning trajectories during high harmonic generation can be observed in the experiment.
我们从理论上研究了氩气中高次谐波产生过程中的量子路径干涉，并观测到了与驱动激光脉冲啁啾相关的多量子路径干涉（MQPI）效应。我们成功地识别出了在“孤立”原子与驱动激光场相互作用中，源于四条显著贡献量子路径的干涉。此外，当考虑三维传播时，通过用于透射光角度选择性探测的空间滤波，在单原子响应之外进一步证明了MQPI效应。这意味着在实验中可以观测到高次谐波产生过程中高阶电子返回轨迹的作用。
