Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

doi:10.1088/1674-1056/ad10fc

中国物理B ›› 2024, Vol. 33 ›› Issue (3): 33202-033202.doi: 10.1088/1674-1056/ad10fc

Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

Xiao-Yong Lu(卢肖勇)^1,† and Ya-Peng Sun(孙亚鹏)^1,2

1 Science and Technology on Particle Transport and Separation Laboratory, Tianjin 300180, China;
2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

收稿日期:2023-09-02 修回日期:2023-11-28 接受日期:2023-11-30 出版日期:2024-02-22 发布日期:2024-02-29
通讯作者: Xiao-Yong Lu E-mail:lu-xy15@tsinghua.org.cn

Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

Xiao-Yong Lu(卢肖勇)^1,† and Ya-Peng Sun(孙亚鹏)^1,2

1 Science and Technology on Particle Transport and Separation Laboratory, Tianjin 300180, China;
2 Department of Engineering Physics, Tsinghua University, Beijing 100084, China

Received:2023-09-02 Revised:2023-11-28 Accepted:2023-11-30 Online:2024-02-22 Published:2024-02-29
Contact: Xiao-Yong Lu E-mail:lu-xy15@tsinghua.org.cn

摘要/Abstract

摘要： The four-color three-step selective photoionization process of atom is very important in laser isotope separation technology. The population trapping phenomena and their influences are studied theoretically in monochromatic and non-monochromatic laser fields based on the density matrix theory in this work. Time evolutions of the photoionization properties of the four-color, three-step process are given. The population trapping effects occur intensely in monochromatic excitation, while it gradually turns weak as the laser bandwidth increases. The effects of bandwidth, Rabi frequency, time delay, and frequency detuning on the population trapping effect are investigated in monochromatic and non-monochromatic laser fields. The effects of laser process parameters and atomic parameters on the effective selective photoionization are also discussed. The ionization probability and selectivity factors, as evaluation indexes, are difficult to improve synchronously by adjusting systematic parameters. Besides, the existence of metastable state may play a negative role when its population is low enough.

关键词: population trapping, metastable state, selective photoionization, laser bandwidth

Abstract: The four-color three-step selective photoionization process of atom is very important in laser isotope separation technology. The population trapping phenomena and their influences are studied theoretically in monochromatic and non-monochromatic laser fields based on the density matrix theory in this work. Time evolutions of the photoionization properties of the four-color, three-step process are given. The population trapping effects occur intensely in monochromatic excitation, while it gradually turns weak as the laser bandwidth increases. The effects of bandwidth, Rabi frequency, time delay, and frequency detuning on the population trapping effect are investigated in monochromatic and non-monochromatic laser fields. The effects of laser process parameters and atomic parameters on the effective selective photoionization are also discussed. The ionization probability and selectivity factors, as evaluation indexes, are difficult to improve synchronously by adjusting systematic parameters. Besides, the existence of metastable state may play a negative role when its population is low enough.

Key words: population trapping, metastable state, selective photoionization, laser bandwidth

中图分类号: (Photoionization and excitation)

32.80.-t

32.80.Rm (Multiphoton ionization and excitation to highly excited states) 37.10.Vz (Mechanical effects of light on atoms, molecules, and ions) 32.70.Jz (Line shapes, widths, and shifts)

Xiao-Yong Lu(卢肖勇) and Ya-Peng Sun(孙亚鹏). Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme[J]. 中国物理B, 2024, 33(3): 33202-033202.

Xiao-Yong Lu(卢肖勇) and Ya-Peng Sun(孙亚鹏). Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme[J]. Chin. Phys. B, 2024, 33(3): 33202-033202.

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Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

Theoretical investigations of population trapping phenomena in atomic four-color, three-step photoionization scheme

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