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高频激光脉宽对原子光电子发射谱的影响

郭晶 郭福明 陈基根 杨玉军

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高频激光脉宽对原子光电子发射谱的影响

郭晶, 郭福明, 陈基根, 杨玉军

Pulse duration effect on photoelectron spectrum of atom irradiated by strong high frequency laser

Guo Jing, Guo Fu-Ming, Chen Ji-Gen, Yang Yu-Jun
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  • 采用广义含时伪谱方法数值求解原子在激光脉冲作用下的动量空间含时薛定谔方程,研究了高频激光脉宽对原子光电子发射谱的影响.数值模拟表明,随着激光脉冲宽度的增加,光电子谱干涉结构的振荡幅值逐渐减小,其最大峰值的强度和位置取决于产生有效电离的最大即时强度.通过分析光电子谱的变化规律能进一步加深对高频强场电离产生的动力学干涉效应的理解.
    With the development of high harmonic generation and the free electron laser,one can obtain the laser pulses whose frequencies range from XUV to X ray.Using these novel light sources,one can investigate the electron dynamics with attosecond resolution.With the increase of intensity,a lot of nonlinear processes have been found,such as high harmonic generation, above threshold ionization and dynamic stabilization of atomic ionization.When the atom is irradiated by an ultra-intense short laser pulse,many additional sub-peaks appear in the original photoelectron peaks.The original peaks of the photoelectron spectra are formed by the ionization interference from different optical cycles.The formation of sub-peaks are attributed to the shift energy level by the action of strong laser electric field.In previous studies,the sub-peak phenomenon was mainly observed in the short pulse.In this work,we investigate the duration effect of laser pulse on this phenomenon.The photoelectron is calculated from the time-dependent wavefunction in momentum by using generalized time dependent pseudo spectral scheme.At small laser intensity,there is only main photoelectron peak near the position whose energy is the difference between the central frequency of the laser and ionization energy.As the laser duration decreases,the width of the photoelectron peak gradually increases.For the higher laser intensity,many sub-peaks appear in the photoelectron spectra.The width of the sub-peak is also decreasing with the increase of the laser pulse's duration. The amplitude of these sub-peaks is decreasing with the increasing of the duration of laser pulse.For the longer pulse (50 optical cycles),these sub-peaks disappear.The variation of the amplitude and energy position for the first sub-peak with the laser intensity is analyzed.As the increase of laser pulse width,the energy of the sub-peak increased.Comparing with the longer pulse,the short pulse has a larger enhancement.In order to understand the profiles of the photoelectron spectra,we investigate the time-dependent ionization profile of the atom.The results show that the ionization occurs in the whole duration of the laser pulse for small incident intensity.The ionization mainly occurs at the raising edge of the laser pulse for the large laser intensity.For the longer pulse,the gradient of laser intensity is small.Its energy level shift effects on the ground state of the atom is small.Thus, one can not observe any sub-peak in the photoelectron spectrum of atom irradiated by the long laser pulse.
      通信作者: 杨玉军, yangyj@jlu.edu.cn
    • 基金项目: 国家重点研发计划(批准号:2017YFA0403300)、国家自然科学基金(批准号:11774129,11274141,11627807,11534004)和吉林省自然科学基金(批准号:20170101153JC)资助的课题.
      Corresponding author: Yang Yu-Jun, yangyj@jlu.edu.cn
    • Funds: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0403300), the National Natural Science Foundation of China (Grant Nos. 11774129, 11274141, 11627807, 11534004), and the Jilin Provincial Research Foundation for Basic Research, China (Grant No. 20170101153JC).
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    Mcpherson A, Gibson G, Jara H, Johann U, Luk T S, Mcintyre I A, Boyer K, Rhodhes C K 1987 J. Opt. Soc. Am. B 4 595

    [3]

    Dromey B, Zepf M, Gopal A, Lancaster K 2006 Nat. Phys. 2 456

    [4]

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    [5]

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    [6]

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    [7]

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    [8]

    Emma P, Akre R, Arthur J 2010 Nat. Photon. 4 641

    [9]

    Huang Z, Brachmann A, Decker F J 2010 Physical Review Special Topics-Accelerators and Beams 13 020703

    [10]

    Allaria E, Appio R 2012 Nat. Photon. 6 699

    [11]

    Tetsuya I, Hideki A 2012 Nat. Photon. 6 540

    [12]

    Treusch R, Feldhaus J 2010 New J. Phys. 12 035015

    [13]

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    [14]

    Minitti M P, Budarz J M 2015 Phys. Rev. Lett. 114 255501

    [15]

    Kyung T K, Villeneuve D M, Corkum P B 2014 Nature Photon. 8 187

    [16]

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    [17]

    Goulielmakis E, Yakovlev V S, Cavalieri A L 2007 Science 317 769

    [18]

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    [19]

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    [20]

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    [21]

    Hishikawa A, Fushitani M, Hikosaka Y 2011 Phys. Rev. Lett. 107 243003

    [22]

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    [23]

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    Protopapas M, Keitel C H, Knight P L 1997 Rep. Prog. Phys. 60 389

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    [29]

    Hertz H 1887 Annalen der Physik 267 983

    [30]

    Einstein A 1905 Annalen der Physik 322 132

    [31]

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    [32]

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    [33]

    Zhou Z Y, Chu S I 2011 Phys. Rev. A 83 013405

    [34]

    Philipp V D, Lorenz S C 2012 Phys. Rev. Lett. 108 253001

    [35]

    Mehrdad B, Ulf S, Jan M R 2017 Phys. Rev. Lett. 118 143202

    [36]

    Aleksander S S, Tor K, Eva L 2016 Phys. Rev. A 93 053411

    [37]

    Sun F, Wei D, Zhang G Z, Ding X, Yao J Q 2016 Chin. Phys. Lett. 33 123202

    [38]

    Zhang S B, Nina R 2014 Phys. Rev. A 89 013407

    [39]

    Yu C, Fu N, Hu T, Zhang G Z, Yao J Q 2013 Phys. Rev. A 88 043408

    [40]

    Philipp V D, Lorenz S C 2013 Phys. Rev. A 88 043414

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出版历程
  • 收稿日期:  2017-01-01
  • 修回日期:  2018-01-01
  • 刊出日期:  2018-04-05

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