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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 |
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Abstract 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.
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Received: 23 May 2018
Accepted manuscript online:
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PACS:
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32.80.Rm
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(Multiphoton ionization and excitation to highly excited states)
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33.80.Wz
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(Other multiphoton processes)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11334009, 11474321, and 11527807). |
Corresponding Authors:
Xuan-Yang Lai, Xiao-Jun Liu
E-mail: xylai@wipm.ac.cn;xjliu@wipm.ac.cn
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Cite this article:
Yi-Yi Huang(黄祎祎), Xuan-Yang Lai(赖炫扬), Xiao-Jun Liu(柳晓军) High-order harmonic generation in a two-color strong laser field with Bohmian trajectory theory 2018 Chin. Phys. B 27 073204
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