Jin Facheng, Yang Huihui, Zhang Hongdan, Wang Bingbing, Yang Weifeng
Opt Express. 2021 Mar 29;29(7):10726-10736. doi: 10.1364/OE.420316.
By employing the frequency-domain theory, we investigate the influence of polarization directions on angle-resolved photoelectron energy spectrum in the above-threshold ionization (ATI) process of atoms exposed to the IR+XUV two-color laser fields, which shows the multiplateau structures. When the ionized electron is emitted along the IR laser's polarization direction, the width of each plateau keeps a certain energy range, and the jet structures and main lobes are determined by both the emission angle relative to the polarization direction of the XUV laser field and the number of the XUV photons absorbed by the electron. While when the ionized electron is emitted along the XUV laser's polarization direction, the width of each plateau depends on the polarization direction of the IR laser field, and the angular distribution of the ionized electron exhibits the isotropic characteristics. These results show that the ATI spectrum may be effectively controlled by changing the angle between the two laser fields' polarization directions.
通过运用频域理论，我们研究了在红外 + 极紫外双色激光场作用下原子的阈上电离（ATI）过程中，极化方向对角度分辨光电子能谱的影响，该能谱呈现出多平台结构。当电离电子沿红外激光的极化方向发射时，每个平台的宽度保持在一定能量范围内，并且射流结构和主瓣由相对于极紫外激光场极化方向的发射角以及电子吸收的极紫外光子数共同决定。而当电离电子沿极紫外激光的极化方向发射时，每个平台的宽度取决于红外激光场的极化方向，并且电离电子的角分布呈现各向同性特征。这些结果表明，通过改变两个激光场极化方向之间的夹角，可以有效地控制ATI谱。
