中国物理B ›› 2018, Vol. 27 ›› Issue (7): 73204-073204.doi: 10.1088/1674-1056/27/7/073204
• SPECIAL TOPIC—Recent advances in thermoelectric materials and devices • 上一篇 下一篇
High-order harmonic generation in a two-color strong laser field with Bohmian trajectory theory
Yi-Yi Huang(黄祎祎), Xuan-Yang Lai(赖炫扬), Xiao-Jun Liu(柳晓军)
- 1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
High-order harmonic generation in a two-color strong laser field with Bohmian trajectory theory
Yi-Yi Huang(黄祎祎)1,2, Xuan-Yang Lai(赖炫扬)1, Xiao-Jun Liu(柳晓军)1
- 1 State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China
摘要：
We theoretically study the high-order harmonic generation (HHG) in a two-color laser field using the Bohmian mechanics. Our results show that, for the case of a weak second-color laser field, the simulation of the HHG with only one central Bohmian trajectory is in a good agreement with the ab initio time-dependent Schrödinger equation (TDSE) results. In contrast, with the increase of the amplitude of the second-color laser field, the HHG spectra from the single central Bohmian trajectory deviate from the TDSE results more and more significantly. By analyzing the Bohmian trajectories, we find that the significant deviation is due to the fact that the central Bohmian trajectory leaves the core quickly in the two-color laser field with the breaking of inversion symmetry. Interestingly, we find that another Bohmian trajectory with different initial position, which keeps oscillating around the core, could qualitatively well reproduce the TDSE results. Furthermore, we study the HHG spectrum in a two-color laser field with inversion symmetry and find that the HHG spectrum in TDSE can be still well simulated with the central Bohmian trajectory. These results indicate that, similar to the case of one color laser field, the HHG spectra in a two-color laser field can be also reproduced with a single Bohmian trajectory, although the initial position of the trajectory is dependent on the symmetry of the laser field. Our work thus demonstrates that Bohmian trajectory theory can be used as a promising tool in investigating the HHG process in a two-color laser field.
中图分类号: (Multiphoton ionization and excitation to highly excited states)
- 32.80.Rm