强场阈上电离中的电子波包干涉图像

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英文篇名：Electron Wavepacket Interference Patterns in Above-Threshold Ionization by Intense Laser Fields 作者：郭志坚 ; 孙乾 英文作者：Guo Zhijian;Sun Qian;College of Electrical Engineering,Longdong University; 关键词：原子与分子物理学 ; 强场物理 ; 阈上电离 ; 电子波包干涉 ; 二维动量谱 ; 光电子能谱 英文关键词：atomic and molecular physics;;strong field laser physics;;above-threshold ionization;;electron wavepacket interference;;two-dimensional momentum spectrum;;photoelectron energy spectrum 中文刊名：JGDJ 英文刊名：Laser & Optoelectronics Progress 机构：陇东学院电气工程学院; 出版日期：2018-11-23 09:01 出版单位：激光与光电子学进展 年：2019 期：v.56;No.643 基金：国家自然科学基金(11565018);; 陇东学院博士基金(XYBY1601);陇东学院青年科技创新项目(XYZK1706) 语种：中文; 页：JGDJ201908007 页数：6 CN：08 ISSN：31-1690/TN 分类号：73-78

摘要

利用改进的强场近似方法,结合时间窗函数,分析了氢原子在强场阈上电离过程中的电子波包(EWP)干涉对光电子能谱及二维(2D)动量谱的影响,发现光电子能谱及2D动量谱的一般特征是由周期内干涉和周期间干涉的共同作用引起的,2D动量谱中的扇形结构是由长程库仑势与周期内干涉作用引起的。利用含时薛定谔方程(TDSE)的数值解分析了多周期脉冲电离过程中周期内干涉被抑制的原因,发现当Keldysh参数接近1时,2D动量谱中出现了特殊的条纹结构,研究结果表明长程库仑势对该条纹的形成有重要的影响。
        By using the improved strong field approximation method combined with the time window function,the effect of hydrogen atomic electron wavepacket(EWP)interference in above-threshold ionization by a strong laser field on the photoelectron energy spectra and two-dimensional(2D )momentum spectra is analyzed.It is found that the general characteristics of photoelectron energy spectra and 2D momentum spectra are formed by the interplay of inter-cycle and intra-cycle interferences.The fanlike structure in the 2D momentum spectra is caused by the longrange Coulomb potential and the intra-cycle interference.A numerical solution of the time-dependent Schrdinger equation(TDSE)is used to analyze the reason why the intra-cycle interference is suppressed in multi-cycle pulse ionization and it is found that this special fringe appears in the 2D momentum spectra only when the Keldysh parameter is close to 1.These results show that the long-range Coulomb potential has an important influence on the formation of these fringes.

引文

[1] Guo Z J.Effects of long-range Coulomb potential in above-threshold ionization energy spectra of atoms[J].Laser &Optoelectronics Progress,2018,55(9):090201.郭志坚.长程库仑势在原子阈上电离能谱中的影响[J].激光与光电子学进展,2018,55(9):090201.
    [2] Zheng Y,Yang Y F,Zhao X,et al.Research progress on spectral beam combining technology of high-power fiber lasers[J]. Chinese Journal of Lasers,2017,44(2):0201002.郑也,杨依枫,赵翔,等.高功率光纤激光光谱合成技术的研究进展[J].中国激光,2017,44(2):0201002.
    [3] Liu J,Tan F Z,Liu C,et al.Progress on highpower ultrashort-pulsed thulium-doped fiber lasers[J].Chinese Journal of Lasers,2017,44(2):0201003.刘江,谭方舟,刘晨,等.高功率超短脉冲掺铥光纤激光器的研究进展[J].中国激光,2017,44(2):0201003.
    [4] Lin C D,Le A T,Chen Z J,et al.Strong-field rescattering physics:Self-imaging of a molecule by its own electrons[J].Journal of Physics B:Atomic,Molecular and Optical Physics,2010,43(12):122001.
    [5] Lindner F,Schatzel M G, Walther H,et al.Attosecond double-slit experiment[J]. Physical Review Letters,2005,95(4):040401.
    [6] Gopal R,Simeonidis K, Moshammer R,et al.Three-dimensional momentum imaging of electron wave packet interference in few-cycle laser pulses[J].Physical Review Letters,2009,103(5):053001.
    [7] Bian X B,Huismans Y,Smirnova O,et al.Subcycle interference dynamics of time-resolved photoelectron holography with midinfrared laser pulses[J].Physical Review A,2011,84(4):043420.
    [8] ArbóD G,Persson E,Burgdrfer J.Time doubleslit interferences in strong-field tunneling ionization[J].Physical Review A,2006,74(6):063407.
    [9] ArbóD G,Ishikawa K L,Schiessl K,et al.Intracycle and intercycle interferences in abovethreshold ionization:The time grating[J].Physical Review A,2010,81(2):021403.
    [10] ArbóD G,Ishikawa K L,Schiessl K,et al.Diffraction at a time grating in above-threshold ionization:The influence of the Coulomb potential[J].Physical Review A,2010,82(4):043426.
    [11] Chen Z J,Morishita T,Le A T,et al.Analysis of two-dimensional high-energy photoelectron momentum distributions in the single ionization of atoms by intense laser pulses[J].Physical Review A,2007,76(4):043402.
    [12] Chen Z J,Le A T,Morishita T,et al.Quantitative rescattering theory for laser-induced high-energy plateau photoelectron spectra[J].Physical Review A,2009,79(3):033409.
    [13] ArbóD G,Miraglia J E,Gravielle M S,et al.Coulomb-Volkov approximation for near-threshold ionization by short laser pulses[J].Physical Review A,2008,77(1):013401.
    [14] Guo Z J,Chen Z J,Zhou X X.Origin of diffraction fringes in two-dimensional photoelectron momentum distributions for single ionization of atoms in fewcycle intense laser pulses[J].Chinese Physics B,2014,23(4):043201.
    [15] Chen Z J,Morishita T,Le A T,et al.Analysis of two-dimensional photoelectron momentum spectra and the effect of the long-range Coulomb potential in single ionization of atoms by intense lasers[J].Physical Review A,2006,74(5):053405.