基于FORTRAN的双色圆偏振激光场光电离的电子涡旋研究

Electron Vortex in Photoionization of Two-Color Circularly Polarized Laser Field Based on FORTRAN

通过求解二维含时薛定谔方程的方法研究了双色反旋圆偏振激光场中He+光电子的电子涡旋。我们用FORTRAN语言编程模拟He+在双色反旋圆偏振激光场中光电子动量分布,发现He+在双色反旋圆偏振激光场中光电子动量分布呈涡旋结构,并且当改变两束激光脉冲的发射顺序时,电子旋涡也会随之发生改变。同时,我们还发现反旋激光场的电子涡旋旋向的变化受两束激光的发射顺序影响。我们利用激光场脉冲的矢势轨迹来揭示电子涡旋的变化规律。

The electron vortex for He in the two-color counter-rotating circularly polarized laser field is studied by solving the two-dimensional time-dependent Schrödinger equation.We use FORTRAN language programming to simulate the photoelectron momentum distribution of He in the two-color counter-rotating circularly polarized laser field,and find that the He photoelectron momentum distribution in the two-color counter-rotating circularly polarized laser field is in a vortex structure,and when the emission sequence of the two laser pulses is changed,the electron vortex also changes accordingly.At the same time,we also find that the change of the electron vortex direction of the counter-rotating laser field is affected by the emission sequence of the two lasers.We use the vector potential trajectory of the laser field pulse to illustrate the changing law of the electron vortex.