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Dependence of above-threshold ionization spectrum on polarization directions of two-color laser fields |
| Liu Min (刘敏)a b, Guo Ying-Chun (郭迎春)a, Wang Bing-Bing (王兵兵)b |
a Department of Physics, East China Normal University, Shanghai 200241, China;
b Laboratory of Optical Physics, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China |
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Abstract Using the frequency-domain theory, we investigate the above-threshold ionization (ATI) process of an atom in two-color laser fields. When both photon energies of the two-color laser fields are much smaller than the atomic ionization threshold, the ATI spectrum depends on the angle between the two lasers' polarization directions. While when the photon energy of one laser is comparable with or larger than the atomic ionization threshold, the ATI spectrum is independent of the angle, and only several dips appear at certain angles. By analyzing the contributions of different quantum channels, we find that, for the case that both frequencies of the two color lasers are low, the quantum interferences between the channels are strong, and hence the spectrum changes with the angle between the two lasers' polarization directions. While for the case that the frequency of one of the two color lasers is high, the contributions of the channels to the ATI spectrum decrease dramatically with increasing channel order, hence the interferences between the channels disappear, and the ATI spectrum has a step-like structure, which is independent of the angle between the two lasers' polarizations. These results can shed light on the study of the corresponding relation between classical and quantum mechanisms of the matter–laser interaction in high-frequency laser fields.
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Received: 23 December 2014
Revised: 05 March 2015
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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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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42.65.Ky
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(Frequency conversion; harmonic generation, including higher-order harmonic generation)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 11474348 and 61275128). |
Corresponding Authors:
Guo Ying-Chun, Wang Bing-Bing
E-mail: ycguo@phy.ecnu.edu.cn;wbb@aphy.iphy.ac.cn
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Cite this article:
Liu Min (刘敏), Guo Ying-Chun (郭迎春), Wang Bing-Bing (王兵兵) Dependence of above-threshold ionization spectrum on polarization directions of two-color laser fields 2015 Chin. Phys. B 24 073201
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