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
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.
Corresponding Authors:
Xiao-Yong Lu
E-mail: lu-xy15@tsinghua.org.cn
Cite this article:
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 2024 Chin. Phys. B 33 033202
[1] Bokhan P A, Buchanov V V, Fateev N V, Kalugin M M, Kazaryan M A, Prokhorov A M and Zakrevskii D E 2006 Laser isotope separation in atomic vapor (John Wiley & Sons) pp. 91-100 [2] Wendt K, Mattolat C, Gottwald T, Kron T, Raeder S, Rothe S, Schwellnus F and Tomita H 2013 Phys. Rev. A88 052510 [3] Nakhate S G, Bhattacharyya S, Mukund S, Behera R, Pradhan S, Bhatia M S, Datar V M, Nanal V, Pillay R G and Wategaonkar S J 2019 Appl. Phys. B125 23 [4] Saleem M, Hussain S, Rafiq M and Baig M A 2006 J. Appl. Phys.100 053111 [5] Pratt S T 1995 Rep. Prog. Phys.58 821 [6] Sun Y N, Wang Y H, Song L L, Du H B, Wang X C, He L H, Luo S Z, Yang Q, Leng J and Liu F C 2020 Chin. Phys. B29 093201 [7] Schleier D, Constantinidis P, Faβheber N, Fischer I, Friedrichs G, Hemberger P, Reusch E, Sztáray B and Voronova K 2018 Phys. Chem. Chem. Phys.20 10721 [8] Park H, Kwon D H, Cha Y H, Kim T S, Han J, Ko K H, Jeong D Y and Kim C J 2008 J. Nucl. Sci. Technol.45 111 [9] D'yachkov A B, Gorkunov A A, Labozin A V, Makoveeva K A, Mironov S M, Firsov V A, Tsvetkov G O and Panchenko V Y 2021 Quantum Electron.51 317 [10] Sankari M and Suryanarayana M V 2015 J. Nucl. Eng. Radiat. Sci.1 041017 [11] Gomonai A, Kelman V and Plekan O 2003 Radiat. Phys. Chem.68 137 [12] Saini V K, Talwar S, Subrahmanyam V V, Mishra R K, Saini P K and Dixit S K 2020 Phys. Scr.95 075403 [13] Suryanarayana M V 2023 Sci. Rep.13 7001 [14] D'yachkov A B, Gorkunov A A, Labozin A V, Mironov S M, Panchenko V Y and Firsov V A 2016 Quantum Electron.46 574 [15] Park S J and Kim J B 2020 Hyperfine Interact.241 1 [16] Ning X J, Lin F C and Jing C M 1998 Acta Opt. Sin.18 431 (in Chinese) [17] Dalton B J and Knight P L 1982 J. Phys. B15 3997 [18] Dalton B J, McDuff R and Knight P L 2010 Opt. Acta: Int. J. Opt.32 61 [19] Li G X, Peng J S and Zhou P 1997 J. Mod. Opt.44 505 [20] Zhang L, Yan L Y, Bao H H, Chai X X, Ma D D, Wu Q N, Xia L C, Yao D and Qian J 2017 Acta Phys. Sin.66 213301 (in Chinese) [21] Song Y, Han S, Yang Y J, Guo F M and Li S Y 2020 Chin. Phys. B29 093204 [22] Yakovlenko S I 1999 Russ. Phys. J.42 732 [23] Lu X Y, Wang L D and Li Y F 2022 Chin. Phys. B31 063203 [24] Liu C P, Gong S Q, Zheng Z X and Xu Z Z 2003 Chin. Opt. Lett.1 423 [25] Lambropoulos P and Lyras A 1989 Phys. Rev. A40 2199 [26] Lyras A, Zorman B and Lambropoulos P 1990 Phys. Rev. A42 543 [27] Stettler J D, Bowden C M, Witriol N M and Eberly J H 1979 Phys. Lett. A73 171 [28] Katoh K and Suzuki A 1990 J. Nucl. Sci. Technol.27 554 [29] Ning X J, Jing C Y and Lin F C 1996 Chin. J. Lasers13 590 [30] Ning X J 2003 J. Opt. Soc. Am. B20 2363 [31] Lu X Y 2020 Optik204 164116 [32] Fan X, Liu C, Tian S, Li J, Zhu M, Cui N and Gong S 2004 J. Mod. Opt.51 399 [33] Ning X J, Jing C M and Lin F C 1996 Chin. Phys. Lett.13 590
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