Investigating tunneling process of atom exposed in circularly polarized strong-laser field
Investigating tunneling process of atom exposed in circularly polarized strong-laser field
复制标题
研究原子在圆偏振强激光场中的隧穿过程
DOI：
10.1088/1361-6455/aa5991
复制
发表时间：
2017
影响因子：
1.6
通讯作者：
Liu HongPing
中科院分区：
文献类型：
--
作者：
Yuan MingHu;Xin PeiPei;Chu TianShu;Liu HongPing
提出了一种通过分析圆偏振激光的瞬时电离率来研究隧穿过程的方法。数值计算表明，对于长脉冲激光作用下的原子，如果原子的初始电子态波函数是非球对称的，则在激光脉冲峰值强度附近的真实的时间范围内，电离率随激光周期的延迟相移可以用来探测隧穿时间.在这个区域，观察到超过190阿秒的明显的时间延迟相移。进一步的研究表明，在较短波长的激光脉冲作用下，原子在电离过程中具有较长的隧穿时间。在我们的方法中，Wigner旋转技术被用来数值求解三维球坐标系中的单激活电子的含时薛定谔方程。
We propose a method for studying the tunneling process by analyzing the instantaneous ionization rate of a circularly polarized laser. A numerical calculation shows that, for an atom exposed to a long laser pulse, if its initial electronic state wave function is non-spherical symmetric, the delayed phase shift of the ionization rate vs the laser cycle period in real time in the region close to the peak intensity of the laser pulse can be used to probe the tunneling time. In this region, an obvious time delay phase shift of more than 190 attoseconds is observed. Further study shows that the atom has a longer tunneling time in the ionization under a shorter wavelength laser pulse. In our method, a Wigner rotation technique is employed to numerically solve the time-dependent Schrödinger equation of a single-active electron in a three-dimensional spherical coordinate system.