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氢原子在少周期强激光场中阈上电离的电子波包干涉图像

郭志坚 孙乾

郭志坚, 孙乾. 氢原子在少周期强激光场中阈上电离的电子波包干涉图像[J]. 中国光学, 2019, 12(6): 1376-1384. doi: 10.3788/CO.20191206.1376
引用本文: 郭志坚, 孙乾. 氢原子在少周期强激光场中阈上电离的电子波包干涉图像[J]. 中国光学, 2019, 12(6): 1376-1384. doi: 10.3788/CO.20191206.1376
GUO Zhi-jian, SUN Qian. Electron wave packet interference images in above-threshold ionization of hydrogen atoms by few-cycle intense laser fields[J]. Chinese Optics, 2019, 12(6): 1376-1384. doi: 10.3788/CO.20191206.1376
Citation: GUO Zhi-jian, SUN Qian. Electron wave packet interference images in above-threshold ionization of hydrogen atoms by few-cycle intense laser fields[J]. Chinese Optics, 2019, 12(6): 1376-1384. doi: 10.3788/CO.20191206.1376

氢原子在少周期强激光场中阈上电离的电子波包干涉图像

doi: 10.3788/CO.20191206.1376
基金项目: 

国家自然科学基金资助项目 11565018

甘肃省教育厅高等学校创新能力项目 2019A-112

陇东学院博士基金资助项目 XYBY1601

陇东学院青年科技创新项目 XYZK1706

详细信息
    作者简介:

    郭志坚(1991—), 男, 甘肃庆阳人, 硕士, 讲师, 2011年、2014年于西北师范大学分别获得学士、硕士学位, 现为陇东学院物理系讲师, 主要从事强场电离方面的研究。E-mail:zjguo@outlook.com

  • 中图分类号: O436

Electron wave packet interference images in above-threshold ionization of hydrogen atoms by few-cycle intense laser fields

Funds: 

National Natural Science Foundation of China 11565018

Innovation Ability Project of Colleges and Universities of Gansu Provincial Department of Education 2019A-112

Doctoral Foundation of Longdong University XYBY1601

Longdong University Youth Science and Technology Innovation Project XYZK1706

More Information
  • 摘要: 采用电子波包干涉方法研究了长程库仑势以及再散射电子对氢原子在少周期强激光场中阈上电离的影响。首先,利用强场近似及Coulomb-Volkov近似结合时间窗函数,模拟了氢原子在波长为800 nm且脉宽为5 fs的线性极化激光场中单电离的周期内干涉及周期间干涉图像,发现在长程库仑势作用下周期内干涉及周期间干涉共同作用形成了二维动量谱中的部分扇形结构条纹,其余部分扇形条纹的形成与再散射电子有关。然后,通过数值求解含时薛定谔方程计算了深度隧穿电离机制下氢原子的二维动量谱,在二维动量谱中出现了明显的径向条纹。研究结果表明,该径向条纹的产生与长程库仑势无关,是再散射电子波包干涉形成的。
  • 图  1  激光场的电场及矢势,I=4.0×1014 W/cm2, λ=800 nm, CEP=0, Γ=5 fs

    Figure  1.  Electric field and vector potential of laser field with I=4.0×1014 W/cm2, λ=800 nm, CEP=0, Γ=5 fs

    图  2  氢原子电子波包干涉形成的二维动量谱

    Figure  2.  2D momentum spectra of H atom with EPs interferences

    图  3  CVA方法得到的电子波包干涉形成的光电子能量谱,激光参数与图 1相同。(a)周期内干涉;(b)周期间干涉;(c)周期内干涉和周期间干涉相互作用的结果

    Figure  3.  Photoelectron energy spectra of EPs interferences by CVA under the same laser field as shown in Fig. 1. (a)Intracycle interference; (b)intercycle interference; (c) intercycle and intracycle interferences

    图  4  H原子二维光电子动量谱,激光参数与图 1相同

    Figure  4.  2D photoelectron momentum spectra of H atom under the same laser field as shown in Fig. 1

    图  5  H原子能量谱,激光参数与图 1相同

    Figure  5.  Photoelectron energy spectra of H atom with under the same laser field as shown in Fig. 1

    图  6  H原子TDSE二维光电子动量谱,I=4.0×1014 W/cm2λ=800 nm,CEP=0。(a)、(c)及(e)为考虑库仑势的计算结果,(b)、(d)及(f)为考虑短程势的计算结果;(a)和(b)脉冲持续时间为2 cycles;(c)和(d)为4 cycles;(e)和(f)为8 cycles

    Figure  6.  TDSE 2D photoelectron momentum spectra of H atom when I=4.0×1014 W/cm2, λ=800 nm and CEP=0. (a)、(c) and (e) calculated with coulomb potential, (b)、(d) and (f) calculated without coulomb potential; (a) and (b) with 2 cycles pulse; (c) and (d) with 4 cycles pulse; (e) and (f) with 8 cycles pulse

    图  7  H原子二维光电子动量谱及对应的电场和矢势,激光参数与图 6(a)相同。(a)电场和矢势;(b)SFA结果;(c)CVA结果;(d)SFA2结合时间窗的结果;(e)SFA2结果

    Figure  7.  Electric field and vector potential, and 2D photoelectron momentum spectra of H atom under the same laser field as shown in Fig. 6(a). (a)Electric field and vector potential; (b)result from SFA; (c)result from CVA; (d)result from SFA2 with time windows; (e)result from SFA2

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出版历程
  • 收稿日期:  2018-12-03
  • 修回日期:  2019-01-30
  • 刊出日期:  2019-12-01

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