Ke Qinghua, Zhou Yueming, Tan Jia, He Mingrui, Liang Jintai, Zhao Yong, Li Min, Lu Peixiang
Opt Express. 2019 Oct 28;27(22):32193-32209. doi: 10.1364/OE.27.032193.
Strong-field photoelectron holography (SFPH), originating from the interference of the direct electron and the rescattering electron in tunneling ionization, is a significant tool for probing structure and electronic dynamics in molecules. We theoretically study SFPH by counter rotating two-color circularly (CRTC) polarized laser pulses. Different from the case of the linearly polarized laser field, where the holographic structure in the photoelectron momentum distribution (PEMD) is clustered around the laser polarization direction, in the CRTC laser fields, the tunneling ionized electrons could recollide with the parent ion from different angles and thus the photoelectron hologram appears in the whole plane of laser polarization. This property enables structural information delivered by the electrons scattering the molecule from different angles to be recorded in the two-dimensional photoelectron hologram. Moreover, the electrons tunneling at different laser cycles are streaked to different angles in the two-dimensional polarization plane. This property enables us to probe the sub-cycle electronic dynamics in molecules over a long time window with the multiple-cycle CRTC laser pulses.
强场光电子全息术（SFPH）源于隧穿电离中直接电子与再散射电子的干涉，是探测分子结构和电子动力学的重要工具。我们通过反向旋转双色圆偏振（CRTC）激光脉冲对SFPH进行了理论研究。与线偏振激光场的情况不同，在光电子动量分布（PEMD）中的全息结构聚集在激光偏振方向周围，在CRTC激光场中，隧穿电离的电子可以从不同角度与母离子重新碰撞，因此光电子全息图出现在激光偏振的整个平面上。这一特性使得从不同角度散射分子的电子所传递的结构信息能够记录在二维光电子全息图中。此外，在不同激光周期隧穿的电子在二维偏振平面上被条纹化到不同角度。这一特性使我们能够利用多周期CRTC激光脉冲在长时间窗口内探测分子中的亚周期电子动力学。
