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Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization |
Li Fang (李芳), Wei Lai (魏来), He Zhi-Cong (何志聪) |
Laboratory of Optical Information Technology, School of Science, Wuhan Institute of Technology, Wuhan 430073, China |
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Abstract We theoretically investigate the quantum path selection in an ultraviolet (UV)-assisted near-infrared field with an UV energy below the ionization threshold. By calculating the ionization probability with different assistant UV frequencies, we find that a resonance-enhanced ionization peak emerges in the region Euvp, where Euv is the photon energy and Ip is the ionization energy. With an attosecond pulse train (APT) centered in the resonance region, we show that the short quantum path can be well selected in the continuum case. By performing the electron trajectory analysis, we have further explained the physical mechanism of the quantum path selection. Moreover, we also demonstrate that in the resonance region, the harmonic emission from the selected paths is more efficient than that with the APT energy above the ionization threshold.
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Received: 21 September 2014
Revised: 04 December 2014
Accepted manuscript online:
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PACS:
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33.20.Xx
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(Spectra induced by strong-field or attosecond laser irradiation)
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Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11204222) and the Natural Science Foundation of Hubei Province, China (Grant Nos. 2013CFB316 and 2014CFB793). |
Corresponding Authors:
Li Fang
E-mail: lifang_wit@hotmail.com
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Cite this article:
Li Fang (李芳), Wei Lai (魏来), He Zhi-Cong (何志聪) Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization 2015 Chin. Phys. B 24 043301
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