Exploration of laser-driven electron-multirescattering dynamics in high-order harmonic generation.
Multiple rescattering processes play an important role in high-order harmonic generation (HHG) in an intense laser field. However, the underlying multi-rescattering dynamics are still largely unexplored. Here we investigate the dynamical origin of multiple rescattering processes in HHG associated with the odd and even number of returning times of the electron to the parent ion. We perform fully ab initio quantum calculations and extend the empirical mode decomposition method to extract the individual multiple scattering contributions in HHG. We find that the tunneling ionization regime is responsible for the odd number times of rescattering and the corresponding short trajectories are dominant. On the other hand, the multiphoton ionization regime is responsible for the even number times of rescattering and the corresponding long trajectories are dominant. Moreover, we discover that the multiphoton- and tunneling-ionization regimes in multiple rescattering processes occur alternatively. Our results uncover the dynamical origin of multiple rescattering processes in HHG for the first time. It also provides new insight regarding the control of the multiple rescattering processes for the optimal generation of ultrabroad band supercontinuum spectra and the production of single ultrashort attosecond laser pulse.
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China.|Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, Department of Physics, National Taiwan University, Taipei 10617, Taiwan.|Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.
Peng-Cheng
PC
Li
Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
Yae-Lin
YL
Sheu
Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.
Hossein Z
HZ
Jooya
College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, China.
Xiao-Xin
XX
Zhou
Center for Quantum Science and Engineering, and Center for Advanced Study in Theoretical Sciences, Department of Physics, National Taiwan University, Taipei 10617, Taiwan.|Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, USA.
Shih-I
SI
Chu