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Calibration of quantitative rescattering model for simulating vortex high-order harmonic generation driven by Laguerre–Gaussian beam with nonzero orbital angular momentum

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Chinese Physics B 2023年第12期32卷 98-107页

作者：韩嘉鑫管仲汪倍羽金成 Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China MIIT Key Laboratory of Semiconductor Microstructure and Quantum Sensing Nanjing University of Science and TechnologyNanjing 210094China

We calibrate the macroscopic vortex high-order harmonic generation(HHG)obtained by the quantitative rescattering(QRS)model to compute single-atom induced dipoles against that by solving the time-dependent Schr?dinger equation(TDSE).We show that the QRS perfectly agrees with the TDSE under the favorable phase-matching condition,and the QRS can accurately predict the main features in the spatial profiles of vortex HHG if the phase-matching condition is not *** uncover that harmonic emissions from short and long trajectories are adjusted by the phase-matching condition through the time-frequency analysis and the QRS can simulate the vortex HHG accurately only when the interference between two trajectories is *** work confirms that it is an efficient way to employ the QRS model in the single-atom response for precisely simulating the macroscopic vortex HHG.

关键词： high-order harmonic generation quantitative rescattering model time-dependent Schr?dinger equation macroscopic propagation orbital angular momentum Laguerre–Gaussian beam

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quantitative rescattering theory for nonsequential double ionization

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Chinese Physics B 2019年第12期28卷 14-32页

作者： Zhangjin Chen Fang Liu Hua Wen Department of Physics College of ScienceShantou University UniversityShantou 515063China

We review the recently improved quantitative rescattering theory for nonsequential double ionization, in which the lowering of threshold due to the presence of electric field at the time of recollision has been taken into account. First,we present the basic theoretical tools which are used in the numerical simulations, especially the quantum theories for elastic scattering of electron as well as the processes of electron impact excitation and electron impact ionization. Then,after a brief discussion about the properties of the returning electron wave packet, we provide the numerical procedures for the simulations of the total double ionization yield, the double-to-single ionization ratio, and the correlated two-electron momentum distribution.

关键词： laser-induced recollision nonsequential double ionization quantitative rescattering model

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Evidence of potential change in nonsequential double ionization

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Chinese Physics B 2021年第2期30卷 262-267页

作者： Changchun Jia Pu Zhang Hua Wen Zhangjin Chen School of Physics and Material Science Anhui UniversityHefei 230039China Department of Physics College of ScienceShantou UniversityShantou 515063China

Recently,the quantitative rescattering model(QRS)for nonsequential double ionization(NSDI)is modified by taking into account the potential change(PC)due to the presence of electric field at the time of *** the improved QRS model,we simulate the longitudinal momentum distributions of doubly charged ions He2+by projecting the correlated two-electron momentum distributions for NSDI of He onto the main *** obtained results are compared directly with the experimental data at different *** is found that when the PC is considered,the width of momentum distributions reduces and the agreement between theory and experiment is improved.

关键词： nonsequential double ionization quantitative rescattering model potential change momentum distribution of doubly charged ion

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