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Chin. Phys. B, 2022, Vol. 31(6): 063203    DOI: 10.1088/1674-1056/ac490b

Numerical studies of atomic three-step photoionization processes with non-monochromatic laser fields

Xiao-Yong Lu(卢肖勇), Li-De Wang(王立德), and Yun-Fei Li(李云飞)
Science and Technology on Particle Transport and Separation Laboratory, Tianjin 300180, China
Abstract  The atomic selective multi-step photoionization process is a critical step in laser isotope separation. In this work, we study three-step photoionization processes with non-monochromatic laser fields theoretically based on the semi-classical theory. Firstly, three bandwidth models, including the chaotic field model, de-correlation model, and phase diffusion model, are introduced into the density matrix equations. The numerical results are compared with each other comprehensively. The phase diffusion model is selected for further simulations in terms of the correspondence degree to physical practice. Subsequently, numerical calculations are carried out to identify the influences of systematic parameters, including laser parameters (Rabi frequency, bandwidth, relative time delay, frequency detuning) and atomic Doppler broadening, on photoionization processes. In order to determine the optimal match among different systematic parameters, the ionization yield of resonant isotope, and selectivity factor are adopted as evaluation indexes to guide the design and optimization process. The results in this work can provide a rewarding reference for laser isotope separation.
Keywords:  non-monochromatic laser field      bandwidth model      ionization yield      selectivity factor  
Received:  02 September 2021      Revised:  23 December 2021      Accepted manuscript online:  07 January 2022
PACS:  32.80.-t (Photoionization and excitation)  
  32.80.Rm (Multiphoton ionization and excitation to highly excited states)  
  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
Corresponding Authors:  Xiao-Yong Lu     E-mail:

Cite this article: 

Xiao-Yong Lu(卢肖勇), Li-De Wang(王立德), and Yun-Fei Li(李云飞) Numerical studies of atomic three-step photoionization processes with non-monochromatic laser fields 2022 Chin. Phys. B 31 063203

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