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

doi:10.1088/1674-1056/ac490b

中国物理B ›› 2022, Vol. 31 ›› Issue (6): 63203-063203.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

收稿日期:2021-09-02 修回日期:2021-12-23 接受日期:2022-01-07 出版日期:2022-05-17 发布日期:2022-06-06
通讯作者: Xiao-Yong Lu E-mail:lu-xy15@tsinghua.org.cn

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

Received:2021-09-02 Revised:2021-12-23 Accepted:2022-01-07 Online:2022-05-17 Published:2022-06-06
Contact: Xiao-Yong Lu E-mail:lu-xy15@tsinghua.org.cn

摘要/Abstract

摘要： 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.

关键词: non-monochromatic laser field, bandwidth model, ionization yield, selectivity factor

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.

Key words: non-monochromatic laser field, bandwidth model, ionization yield, selectivity factor

中图分类号: (Photoionization and excitation)

32.80.-t

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)

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[J]. 中国物理B, 2022, 31(6): 63203-063203.

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[J]. Chin. Phys. B, 2022, 31(6): 63203-063203.

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

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

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