首页 > 论文 > 光学学报 > 39卷 > 6期(pp:602001--1)

由动态Stark效应诱导的氢原子涡旋动量分布

Dynamic-Stark-Effect Induced Distortion of Vortex Momentum Distributions of Hydrogen Atoms

  • 摘要
  • 论文信息
  • 参考文献
  • 被引情况
  • PDF全文
分享:

摘要

采用强场近似方法,对处于两个具有时间延迟的圆偏振激光场中氢原子的涡旋状光电子动量分布进行了数值模拟。在两个延时激光脉冲的作用下,电子吸收光子后克服电离阈值,从基态经由两个不同的通道跃迁到连续态,产生的电子波包之间会发生干涉。模拟结果表明,所产生的光电子动量涡旋的旋向与两脉冲的偏振方向有关,涡旋臂的数目与激光载波频率有关。动态Stark效应是一种典型的强场现象。若在电离发生的同时考虑动态Stark效应,将会观察到动量涡旋的扭曲。对顺时针的动量涡旋及其扭曲进行分析,发现扭曲现象是由动态Stark效应引入的附加相位的时间非线性特性引起的。

Abstract

In this study, the vortex-shaped photoelectron momentum distributions of a hydrogen atom ionized by two time-delayed circularly polarized laser fields are numerically simulated based on the strong field approximation (SFA) theory. Under the action of two time-delayed laser pulses, the electron absorbs photons to overcome the ionization threshold and undergoes photoionization via two different transition channels to reach the continuum states for electron wave-packet interference. The simulation results show that the orientation of the photoelectron momentum vortices is observed to be related with the polarization directions of the two pulses, whereas the number of vortex arms is related with the carrier frequencies. Furthermore, the dynamic Stark effect is a ubiquitous strong field process, which would result in the distortion of the vortex-shaped momentum distributions when considered. On this basis, the clockwise momentum vortices and their distortion are specifically investigated, revealing that the distortion is attributed to the nonlinear properties of the phase associated with the dynamic Stark effect.

Newport宣传-MKS新实验室计划
补充资料

DOI:10.3788/AOS201939.0602001

所属栏目:原子与分子物理学

基金项目:国家自然科学基金;

收稿日期:2019-01-09

修改稿日期:2019-03-04

网络出版日期:2019-06-17

作者单位    点击查看

孔雪莲:天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
张贵忠:天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
汪天庆:天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
丁欣:天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072
姚建铨:天津大学精密仪器与光电子工程学院光电信息技术教育部重点实验室, 天津 300072

联系人作者:张贵忠(johngzhang@tju.edu.cn)

备注:国家自然科学基金;

【1】Brabec T. Strong field laser physics. New York: Springer. 166-168(2008).

【2】Abu-Samha M and Madsen L B. Interrogation of orbital structure by elliptically polarized intense femtosecond laser pulses. Physical Review A. 84(2), (2011).

【3】Peng L Y, Pronin E A and Starace A F. Attosecond pulse carrier-envelope phase effects on ionized electron momentum and energy distributions: roles of frequency, intensity and an additional IR pulse. New Journal of Physics. 10(2), (2008).

【4】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. Physical Review A. 76(4), (2007).

【5】Hu S X. Boosting photo absorption by attosecond control of electron correlation. Physical Review Letters. 111(12), (2013).

【6】He P L, Ruiz C and He F. Carrier-envelope-phase characterization for an isolated attosecond pulse by angular streaking. Physical Review Letters. 116(20), (2016).

【7】Geng J W, Xiong W H, Xiao X R et al. Nonadiabatic electron dynamics in orthogonal two-color laser fields with comparable intensities. Physical Review Letters. 115(19), (2015).

【8】Wu W Y and He F. Asymmetric photoelectron momentum distribution driven by two-color XUV fields. Physical Review A. 93(2), (2016).

【9】Xie H, Li M, Luo S Q et al. Energy-dependent angular shifts in the photoelectron momentum distribution for atoms in elliptically polarized laser pulses. Physical Review A. 96(6), (2017).

【10】Hu S L, Chen J, Hao X L et al. Effect of two-center interference on molecular ionization in multiphoton ionization regime. Optics Express. 25(19), 23082-23092(2017).

【11】Zhou Y M, Huang C, Tong A H et al. Correlated electron dynamics in nonsequential double ionization by orthogonal two-color laser pulses. Optics Express. 19(3), 2301-2308(2011).

【12】Paufler W, Boning B and Fritzsche S. Strong-field ionization with twisted laser pulses. Physical Review A. 97(4), (2018).

【13】Ge P P, Han M, Liu M M et al. Probing time delays and coherent imaging of multiphoton resonant ionization. Physical Review A. 98(1), (2018).

【14】Yu X Y, Li M, Han M et al. Controlling backward-scattering photoelectron holography by attosecond streaking. Physical Review A. 98(1), (2018).

【15】Zhang H D, Ben S, Xu T T et al. Photoelectron-momentum distribution of H2+ molecules at different internuclear distances in an elliptically polarized laser field . Physical Review A. 98(1), (2018).

【16】Wang Y L, Yu S G, Lai X Y et al. Separating intracycle interferences in photoelectron momentum distributions by a polarization-gated pulse. Physical Review A. 98(4), (2018).

【17】Milosevic D B. Attospin and channel closings in high-order above-threshold ionization by bicircular laser fields. Physical Review A. 98(5), (2018).

【18】Wei M Z, Quan W, Sun R P et al. Two-center interference effect in ionization of diatomic molecules subject to close-to-circularly-polarized femtosecond laser fields. Physical Review A. 98(6), (2018).

【19】Yuan K J, Chelkowski S and Bandrauk A D. Photoelectron momentum distributions of molecules in bichromatic circularly polarized attosecond UV laser fields. Physical Review A. 93(5), (2016).

【20】Feng F Z, Bai L H and Zheng X X. Nonsequential double ionization of Mg atoms below threshold laser power density. Acta Optica Sinica. 38(7), (2018).
冯凤珍, 白丽华, 郑晓晓. 低于阈值激光功率密度下Mg原子的非序列双电离. 光学学报. 38(7), (2018).

【21】Lin Z Y, Lin B Q and Chen Z X. Single ionization of atoms driven by ultrafast intense mid-infrared laser fields. Acta Optica Sinica. 38(6), (2018).
林志阳, 林宝卿, 陈志心. 中红外波段超快强激光场驱动的原子单电离. 光学学报. 38(6), (2018).

【22】Chen J H, Han M, Xiao X R et al. Atomic-orbital-dependent photoelectron momentum distributions for F - ions by orthogonal two-color laser fields . Physical Review A. 98(3), (2018).

【23】Ngoko Djiokap J M, Meremianin A V, Manakov N L et al. . Kinematical vortices in double photoionization of helium by attosecond pulses. Physical Review A. 96(1), (2017).

【24】Ngoko Djiokap J M, Hu S X, Madsen L B et al. . Electron vortices in photoionization by circularly polarized attosecond pulses. Physical Review Letters. 115(11), (2015).

【25】Ngoko Djiokap J M, Meremianin A V, Manakov N L et al. . Multistart spiral electron vortices in ionization by circularly polarized UV pulses. Physical Review A. 94(1), (2016).

【26】Pengel D, Kerbstadt S, Johannmeyer D et al. Electron vortices in femtosecond multiphoton ionization. Physical Review Letters. 118(5), (2017).

【27】Delone N B and Krainov V P. AC Stark shift of atomic energy levels. Physics-Uspekhi. 42(7), 669-687(1999).

【28】Yu C and Madsen L B. Sequential and nonsequential double ionization of helium by intense XUV laser pulses: revealing AC Stark shifts from joint energy spectra. Physical Review A. 94(5), (2016).

【29】Autler S H and Townes C H. Stark effect in rapidly varying fields. Physical Review. 100(2), 703-722(1955).

【30】Sussman B J. Five ways to the nonresonant dynamic Stark effect. American Journal of Physics. 79(5), 477-484(2011).

【31】Demekhin P V and Cederbaum L S. Dynamic interference of photoelectrons produced by high-frequency laser pulses. Physical Review Letters. 108(25), (2012).

【32】Etches A and Madsen L B. Extending the strong-field approximation of high-order harmonic generation to polar molecules: gating mechanisms and extension of the harmonic cutoff. Journal of Physics B: Atomic, Molecular and Optical Physics. 43(15), (2010).

【33】Milosevic M Z and Simonovic N S. Calculations of rates for strong-field ionization of alkali-metal atoms in the quasistatic regime. Physical Review A. 91(2), (2015).

【34】Yu C, Fu N, Zhang G Z et al. Dynamic Stark effect on XUV-laser-generated photoelectron spectra: numerical experiment on atomic hydrogen. Physical Review A. 87(4), (2013).

【35】Keldysh L V. Ionization in the field of a strong electromagnetic wave. Soviet Physics JEPT. 20(5), 1307-1314(1965).

【36】Faisal F H M. Multiple absorption of laser photons by atoms. Journal of Physics B: Atomic and Molecular Physic. 6(4), L89-L92(1973).

【37】Reiss H R. Effect of an intense electromagnetic field on a weakly bound system. Physical Review A. 22(5), 1786-1813(1980).

【38】Lewenstein M and Salières P. L’Huillier A. Phase of the atomic polarization in high-order harmonic generation. Physical Review A. 52(6), 4747-4754(1995).

【39】Wu J X, Wang G L, Lü X X et al. Study on ionization of H atoms by intense laser fields with strong-field approximation method. Journal of Atomic and Molecular Physics. 28(2), 277-281(2011).
吴金香, 王国利, 吕向向 等. 用强场近似方法研究强激光场中H原子的电离. 原子与分子物理学报. 28(2), 277-281(2011).

【40】Li M, Zhang G Z, Kong X L et al. Dynamic Stark induced vortex momentum of hydrogen in circular fields. Optics Express. 26(2), 878-886(2018).

【41】Hasovic E, Busuladzic M, Gazibegovic-Busuladzic A et al. Simulation of above-threshold ionization experiments using the strong-field approximation. Laser Physics. 17(4), 376-389(2007).

【42】Yu C and Madsen L B. Above-threshold ionization of helium in the long-wavelength regime: examining the single-active-electron approximation and the two-electron strong-field approximation. Physical Review A. 95(6), (2017).

【43】Hasovic E, Busuladzic M, Becker W et al. Dressed-bound-state molecular strong-field approximation: application to above-threshold ionization of heteronuclear diatomic molecules. Physical Review A. 84(6), (2011).

【44】Liu L, Zhao S F, Li P C et al. Influence of relative carrier envelope phases on attosecond pulse generation from CO molecule exposed to a combined field of lasers. Chinese Journal of Lasers. 40(9), (2013).
刘璐, 赵松峰, 李鹏程 等. 激光的组合场相对相位对CO分子产生阿秒脉冲的影响. 中国激光. 40(9), (2013).

【45】Milosevic D B, Paulus G G, Bauer D et al. Above-threshold ionization by few-cycle pulses. Journal of Physics B: Atomic, Molecular and Optical Physics. 39(14), R203-R262(2006).

【46】Xie X H, Wang T, Yu S G et al. Disentangling intracycle interferences in photoelectron momentum distributions using orthogonal two-color laser fields. Physical Review Letters. 119(24), (2017).

【47】Han M, Ge P P, Shao Y et al. Revealing the sub-barrier phase using a spatiotemporal interferometer with orthogonal two-color laser fields of comparable intensity. Physical Review Letters. 119(7), (2017).

【48】Ivanov I A, Nam C H and Kim K T. Photoionization in the presence of circularly polarized fundamental and odd-order harmonic fields. Physical Review A. 95(5), (2017).

【49】Han M, Ge P P, Shao Y et al. Attoclock photoelectron interferometry with two-color corotating circular fields to probe the phase and the amplitude of emitting wave packets. Physical Review Letters. 120(7), (2018).

【50】Liu M M, Shao Y, Han M et al. Energy- and momentum-resolved photoelectron spin polarization in multiphoton ionization of Xe by circularly polarized fields. Physical Review Letters. 120(4), (2018).

【51】Tulsky V A, Almajid M A and Bauer D. Two-color phase-of-the-phase spectroscopy with circularly polarized laser pulses. Physical Review A. 98(5), (2018).

引用该论文

Xuelian Kong,Guizhong Zhang,Tianqing Wang,Xin Ding,Jianquan Yao. Dynamic-Stark-Effect Induced Distortion of Vortex Momentum Distributions of Hydrogen Atoms[J]. Acta Optica Sinica, 2019, 39(6): 0602001

孔雪莲,张贵忠,汪天庆,丁欣,姚建铨. 由动态Stark效应诱导的氢原子涡旋动量分布[J]. 光学学报, 2019, 39(6): 0602001

您的浏览器不支持PDF插件,请使用最新的(Chrome/Fire Fox等)浏览器.或者您还可以点击此处下载该论文PDF