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High-intensity molecular harmonic generation without ionization |
| Wang Jun (王俊)a, Chen Gao (陈高)b, Guo Fu-Ming (郭福明)a, Li Su-Yu (李苏宇)a, Chen Ji-Gen (陈基根)c, Yang Yu-Jun (杨玉军)a |
a Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China;
b School of Science, Changchun University of Science and Technology, Changchun 130022, China;
c Department of Physics and Materials Engineering, Taizhou University, Taizhou 318000, China |
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Abstract We theoretically investigate the high-order harmonic generation from H2+ in an infrared laser field. Our numerical simulations show that there exists a highly efficient plateau structure in the molecular harmonic spectrum. Under the action of the infrared laser pulse, the bound electronic wave packet in a potential well has enough time to tunnel through the effective potential barrier, which is formed by the molecular potential and the infrared laser field, and then recombine with the neighboring nucleus emitting a harmonic photon. During the entire dynamic process, because the wave packet is mainly located in the effective potential, the diffusion effect is of no significance, and thus a highly efficient harmonic plateau can be achieved. Specifically, the cut-off frequency of the plateau is linearly scaled with the peak amplitude of the infrared laser electric field, which may open another route to examine the internuclear distance of the molecule. Furthermore, one may detect the molecular bond lengths using the harmonic plateau.
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Received: 01 November 2012
Revised: 19 December 2012
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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| Fund: Project supported by the National Basic Research Program of China (Grant No. 2013CB922200), the National Natural Science Foundation of China (Grant Nos. 11274141 and 11034003), and the Natural Science Foundation of Zhejiang Province, China (Grant No. Y6110578). |
Corresponding Authors:
Yang Yu-Jun
E-mail: yangyj@jlu.edu.cn
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Cite this article:
Wang Jun (王俊), Chen Gao (陈高), Guo Fu-Ming (郭福明), Li Su-Yu (李苏宇), Chen Ji-Gen (陈基根), Yang Yu-Jun (杨玉军) High-intensity molecular harmonic generation without ionization 2013 Chin. Phys. B 22 033203
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