Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

中国激光(英文版)

Population Transfer of U Vapor Effected by the Population of a Trapped State

Ning Xijin

Published Jan 1, 1996• 0 citations
OpenAlex

Abstract

A new method of population transfer in an atomic vapor through the trapped state of a three-level system coupled with two ew lasers is proposed. Employing two singlemode dye lasers interacting with 238U atomic vapor in a hollow-cathode discharge tube, it has been demonstrated experimentally that the method has an obvious effect on the population of the three-level A system.

Related papers

A Method for Effective Population Transfer in U Vapor with Doppler Effect and Collision

Xi‐Jing Ning, Chun-yang Jing, Fucheng Lin

We proposed a method for effective population transfer in an atomic vapor with Doppler effect and collision. Using this method, we have demonstrated that an efficient population transfer occurs in 238 U vapor produced in a hollow-cathode discharge tube. A numerical calculation with density matrix agrees well with our experimental result and indicates that the method can be used to raise the efficiency of atomic vapor isotope separation.

Chinese Physics Letters•Aug 1, 1996•3 citations

Radiative and collisional damping effects on efficient population transfer in a three-level system driven by two delayed laser pulses

B. Glushko, Boris Kryzhanovsky

The effect of radiative decay and collisional damping on the delayed-field population transfer in the three-level system is investigated. The simple analytical steady-state solution of the three-level system, interacting with two intense delayed laser pulses in the dressed-state frame, is obtained and analyzed. The radiative relaxation transfers the system to the ``trapped state,'' which is shown to be stable relative to both radiative decay and collisional damping. The effect of an additional level \ensuremath{\Vert}m〉, situated close to the final level \ensuremath{\Vert}3〉, on the population-transfer process is considered. The field-induced relaxation rate from intermediate level \ensuremath{\Vert}2〉 to level \ensuremath{\Vert}3〉 is shown to be a very easily controllable parameter of the field intensities and their relative delay. This result leads to selective population transfer to the desired level and may prevent leaking out of the three-level system. Theoretical analysis corresponds entirely to recent experimental data [U. Gaubatz et al., J. Chem. Phys. 92, 1 (1990); 92, 5363 (1990)].

Physical Review A•Sep 1, 1992•35 citations

Coherent trapping of atomic populations

H. R. Gray, R. M. Whitley, Carlos R. Stroud

It is often desirable in laser spectroscopy and isotope separation to extract as much as possible of an atomic or molecular population that is distributed among a number of ground-state sublevels and low-lying metastable levels. We describe a form of coherent trapping that occurs when multiple resonant laser beams are used to couple the various ground states to a common upper level. This effect prevents the extraction of the entire population. We then study the effect with two dye lasers and an atomic beam and suggest possible ways to maximize the pumping efficiency.

Optics Letters•Dec 1, 1978•768 citations

Study on three level system population transfer

杨山, 旷冶

Stimulated-Raman-adiabatic-passage (STIRAP) process provides an effective technique to transfer electronpopulation from an initial state (e.g. ground state) to excited final state for both atoms and molecules. Inthis paper, we present the results of the study on electron population transfer in three level system. Wehave analyzed the effects of various conditions on the transfer process, such as the time delay of the twolaser beams, two-photon off-resonance, one-photon off-resonance and the change of relative laser intensity.The numerical result is compared with experiment, and the reasons for the effects are also given.

Chinese Optics Letters•Jan 1, 2003•1 citation

Adiabatic population transfer in effective three-level systems driven by laser beams

Zhao Hua, Liang Jiu Qing

The population transfer in effective three-state systems driven by laser beams has been studied based on the theory of Lewis–Riesenfeld Hermitian invariants in the full- and partial-adiabatic approximations. A strict formulation of adiabatic conditions is given and a new adiabatic condition for inducing a complete population transfer is found.

Chinese Physics•Sep 1, 2004•3 citations

Adiabatic passage in three levels closed-loop systems with chirped lasers pulses

Marius Romuald Kamsap, Maïk Delon Mboumba, M.E. Ateuafack +3 more

Abstract This study demonstrates complete adiabatic population transfer in a closed three-level atomic system using chirped laser pulses. By satisfying the three-photon resonance condition, we effectively mitigate the first-order Doppler effect. Under the assumption of weak coupling between the stable levels, we show that relative phase fluctuations of the lasers exert a negligible influence on the population dynamics during the transfer process. A comprehensive analysis of the system parameters is conducted to determine the optimal conditions for achieving 100% population transfer while minimizing the excited state population

Europhysics Letters (EPL)•Oct 24, 2025•1 citation
A new method of population transfer in an atomic vapor through the trapped state of a three-level system coupled with two ew lasers is proposed. Employing two singlemode dye lasers interacting with 238U atomic vapor in a hollow-cathode discharge tube, it has been demonstrated experimentally that the method has an obvious effect on the population of the three-level A system.
The effect of radiative decay and collisional damping on the delayed-field population transfer in the three-level system is investigated. The simple analytical steady-state solution of the three-level system, interacting with two intense delayed laser pulses in the dressed-state frame, is obtained and analyzed. The radiative relaxation transfers the system to the ``trapped state,'' which is shown to be stable relative to both radiative decay and collisional damping. The effect of an additional level \ensuremath{\Vert}m〉, situated close to the final level \ensuremath{\Vert}3〉, on the population-transfer process is considered. The field-induced relaxation rate from intermediate level \ensuremath{\Vert}2〉 to level \ensuremath{\Vert}3〉 is shown to be a very easily controllable parameter of the field intensities and their relative delay. This result leads to selective population transfer to the desired level and may prevent leaking out of the three-level system. Theoretical analysis corresponds entirely to recent experimental data [U. Gaubatz et al., J. Chem. Phys. 92, 1 (1990); 92, 5363 (1990)].
It is often desirable in laser spectroscopy and isotope separation to extract as much as possible of an atomic or molecular population that is distributed among a number of ground-state sublevels and low-lying metastable levels. We describe a form of coherent trapping that occurs when multiple resonant laser beams are used to couple the various ground states to a common upper level. This effect prevents the extraction of the entire population. We then study the effect with two dye lasers and an atomic beam and suggest possible ways to maximize the pumping efficiency.
Stimulated-Raman-adiabatic-passage (STIRAP) process provides an effective technique to transfer electronpopulation from an initial state (e.g. ground state) to excited final state for both atoms and molecules. Inthis paper, we present the results of the study on electron population transfer in three level system. Wehave analyzed the effects of various conditions on the transfer process, such as the time delay of the twolaser beams, two-photon off-resonance, one-photon off-resonance and the change of relative laser intensity.The numerical result is compared with experiment, and the reasons for the effects are also given.
Abstract This study demonstrates complete adiabatic population transfer in a closed three-level atomic system using chirped laser pulses. By satisfying the three-photon resonance condition, we effectively mitigate the first-order Doppler effect. Under the assumption of weak coupling between the stable levels, we show that relative phase fluctuations of the lasers exert a negligible influence on the population dynamics during the transfer process. A comprehensive analysis of the system parameters is conducted to determine the optimal conditions for achieving 100% population transfer while minimizing the excited state population