Liu Kun, Li Min, Xie Wenhai, Guo Keyu, Luo Siqiang, Yan Jiaqing, Zhou Yueming, Lu Peixiang
Opt Express. 2020 Apr 13;28(8):12439-12449. doi: 10.1364/OE.386299.
We theoretically study the interference of photoelectrons released from atomic p orbitals in co-rotating and counter-rotating circularly polarized two-color laser pulses consisting of a strong 400-nm field and a weak 800-nm field. We find that in co-rotating fields the interference fringes in the photoelectron momentum distributions are nearly the same for p orbitals, while in counter-rotating fields the interference fringes for p and p orbitals oscillate out of phase with respect to the electron emission angle. The simulations based on the strong-field approximation show a good agreement with the numerical solutions of the time-dependent Schrödinger equation. We find that different phase distributions of the electron wave packets emitted from p and p orbitals can be easily revealed by the counter-rotating circularly polarized two-color laser fields. We further show that the photoelectron interference patterns in the circularly polarized two-color laser fields record the time differences of the electron wave packets released within an optical cycle.
我们从理论上研究了在由强400纳米场和弱800纳米场组成的同向和反向旋转圆偏振双色激光脉冲中，从原子p轨道释放的光电子的干涉。我们发现，在同向旋转场中，p轨道的光电子动量分布中的干涉条纹几乎相同，而在反向旋转场中，p和p轨道的干涉条纹相对于电子发射角异相振荡。基于强场近似的模拟与含时薛定谔方程的数值解显示出良好的一致性。我们发现，通过反向旋转圆偏振双色激光场可以很容易地揭示从p和p轨道发射的电子波包的不同相位分布。我们进一步表明，圆偏振双色激光场中的光电子干涉图案记录了在一个光周期内释放的电子波包的时间差。
