中国物理B ›› 2015, Vol. 24 ›› Issue (4): 43301-043301.doi: 10.1088/1674-1056/24/4/043301

• ATOMIC AND MOLECULAR PHYSICS • 上一篇    下一篇

Quantum path control using attosecond pulse trains via UV-assisted resonance enhance ionization

李芳, 魏来, 何志聪   

  1. Laboratory of Optical Information Technology, School of Science, Wuhan Institute of Technology, Wuhan 430073, China
  • 收稿日期:2014-09-21 修回日期:2014-12-04 出版日期:2015-04-05 发布日期:2015-04-05
  • 基金资助:

    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).

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)   

  1. Laboratory of Optical Information Technology, School of Science, Wuhan Institute of Technology, Wuhan 430073, China
  • Received:2014-09-21 Revised:2014-12-04 Online:2015-04-05 Published:2015-04-05
  • Contact: Li Fang E-mail:lifang_wit@hotmail.com
  • Supported by:

    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).

摘要:

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.

关键词: ultrashort laser pulse, attosecond pulse, quantum path

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.

Key words: ultrashort laser pulse, attosecond pulse, quantum path

中图分类号:  (Spectra induced by strong-field or attosecond laser irradiation)

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