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

Journal of Modern Optics

Control of spontaneous emission in a four-level system

Yonghong Ma, Jia Liu, Jinyan Niu

Published Feb 27, 2012• 3 citations
Publisher

Abstract

Spontaneous emission in a four-level atomic system coupled by two coherent driven fields is investigated. Using a wave function technique, an explicit expression of the spontaneous emission spectrum is derived. The influence of driven fields on spontaneous emission spectra of k and q photons are investigated. The interesting phenomena including spectral line narrowing, enhancement, suppression and quenching, are observed by adjusting driven fields and detunings.

DOI
10.1080/09500340.2012.663005

Related papers

Control of Spontaneous Emission of a Four-level Atom by a Microwave Field with Lower Frequency

Nian-Hua Liu

We investigate theoretically the features of the spontaneous emission spectrum of a four-level atomic system driven by a coherent probe field,a coupling laser field and a microwave field.The two upper levels are coupled by a microwave field with lower frequency.The time evolution of the populations is calculated.It is shown that the spectra behavior,such as spectral-line narrowing,spectral-line enhancement,spectral-line suppression,and total cancellation of fluorescence quenching,can be easily controlled by changing the phase and the amplitude of the microwave field.

Acta Sinica Quantum Optica•Jan 1, 2010•0 citations

Control of spontaneous emission from a coherently driven four-level atom

Jin‐Hui Wu, Aijun Li, Yue Ding +2 more

We study the spontaneous-emission properties of a coherently driven four-level atom, and show a few interesting phenomena such as fluorescence quenching, spectral-line narrowing, spectral-line enhancement, and spectral-line elimination. These phenomena can be observed in experiment since the rigorous condition of near-degenerate levels with nonorthogonal dipole moments is not required here. Qualitatively, these phenomena can be attributed to the quantum interference between competitive spontaneous-decay channels in the bare-state picture or the spontaneously generated coherence between two close-lying levels in the dressed-state picture.

Physical Review A•Aug 4, 2005•113 citations

Control of spontaneous emission from a micro-wave driven atomic system

Chun Liang Wang, Zhi Hui Kang, Si Cong Tian +1 more

We demonstrate coherent control of spontaneous emission from an indirectly coupled transition in a microwave driven four-level atomic system. The transition of concern is not directly coupled by any laser fields, while the ground state is coupled to another ground state by a microwave field. We show that the coupling of the microwave field produces interesting features such as double narrow lines in the emission spectrum. The heights, widths and positions of the emission peaks can be controlled by modifying the Rabi frequency and detuning of the microwave field. We discuss the spectra in the dressed states basis.

Optics Express•Jan 30, 2012•12 citations

SPONTANEOUS EMISSION SPECTRA AND SIMULATING MULTIPLE SPONTANEOUSLY-GENERATED COHERENCE IN AN N-TYPE MEDIUM

Jiahua Li

We investigate the spontaneous emission spectra of a coherently driven four-level cold atomic system. It is shown that a few interesting phenomena such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, and spontaneous emission quenching can be realized in our system. The spectral-line enhancement and suppression can be conveniently manipulated by appropriately modulating the frequency detuning of the probe driving field. In the dressed-state picture of the probe and coupling fields, we find that this coherently-driven atomic system has three close-lying levels so that multiple spontaneously-generated coherence (SGC) arises. Our considered atomic model can be found in real atoms, such as rubidium or sodium, so a corresponding experiment can be done to observe the expected phenomena related to SGC effect, since no rigorous conditions are required.

Modern Physics Letters B•Jul 10, 2007•3 citations

Effects of spontaneously generated coherence in a microwave-driven four-level atomic system

Aijun Li, Xiaoli Song, Xiaogang Wei +2 more

The effect of spontaneously generated coherence (SGC) on spontaneous emission and dynamical evolution of a microwave-driven four-level atomic system is studied. Interesting phenomena due to SGC, such as spectral-line narrowing, spectra-line enhancement, spectral-line suppression, and fluorescence quenching, are shown in the spontaneous emission spectra, which can be effectively modulated by amplitude and phase of the microwave field. Due to SGC, the total populations are partly, even completely, trapped in upper levels in steady state, the decay time of which is sensitive to the phase of the microwave field. In the dressed state picture, multiple SGC arise during the process of three close-lying states decaying to the same state. The corresponding experiment to observe the expected phenomena related to SGC can be more conveniently realized in atoms, since no rigorous conditions are required and the amplitude and phase of the microwave field can be conveniently controlled.

Physical Review A•May 8, 2008•68 citations

Spontaneous emission spectra from a five-level atom with a loop structure

B Zhang, Xiaohan Sun, Xiangqian Jiang

The spontaneous emission property of a five-level atom with a loop structure driven by three optical fields and a microwave field is intensively studied. Several quantum interference effects can be observed in the spontaneous emission spectra, such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, partial cancellation and fluorescence quenching. The number of emission peaks, the positions of dark lines can be controlled by varying the intensities of driving fields or the phase of the microwave field coupling the two lower levels in the atomic system. Furthermore, since no rigorous conditions are required, the expected phenomena may easily be achieved experimentally in atomic systems.

Journal of Physics B Atomic Molecular and Optical Physics•Oct 29, 2010•4 citations
Spontaneous emission in a four-level atomic system coupled by two coherent driven fields is investigated. Using a wave function technique, an explicit expression of the spontaneous emission spectrum is derived. The influence of driven fields on spontaneous emission spectra of k and q photons are investigated. The interesting phenomena including spectral line narrowing, enhancement, suppression and quenching, are observed by adjusting driven fields and detunings.
We investigate theoretically the features of the spontaneous emission spectrum of a four-level atomic system driven by a coherent probe field,a coupling laser field and a microwave field.The two upper levels are coupled by a microwave field with lower frequency.The time evolution of the populations is calculated.It is shown that the spectra behavior,such as spectral-line narrowing,spectral-line enhancement,spectral-line suppression,and total cancellation of fluorescence quenching,can be easily controlled by changing the phase and the amplitude of the microwave field.
We study the spontaneous-emission properties of a coherently driven four-level atom, and show a few interesting phenomena such as fluorescence quenching, spectral-line narrowing, spectral-line enhancement, and spectral-line elimination. These phenomena can be observed in experiment since the rigorous condition of near-degenerate levels with nonorthogonal dipole moments is not required here. Qualitatively, these phenomena can be attributed to the quantum interference between competitive spontaneous-decay channels in the bare-state picture or the spontaneously generated coherence between two close-lying levels in the dressed-state picture.
We demonstrate coherent control of spontaneous emission from an indirectly coupled transition in a microwave driven four-level atomic system. The transition of concern is not directly coupled by any laser fields, while the ground state is coupled to another ground state by a microwave field. We show that the coupling of the microwave field produces interesting features such as double narrow lines in the emission spectrum. The heights, widths and positions of the emission peaks can be controlled by modifying the Rabi frequency and detuning of the microwave field. We discuss the spectra in the dressed states basis.
We investigate the spontaneous emission spectra of a coherently driven four-level cold atomic system. It is shown that a few interesting phenomena such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, and spontaneous emission quenching can be realized in our system. The spectral-line enhancement and suppression can be conveniently manipulated by appropriately modulating the frequency detuning of the probe driving field. In the dressed-state picture of the probe and coupling fields, we find that this coherently-driven atomic system has three close-lying levels so that multiple spontaneously-generated coherence (SGC) arises. Our considered atomic model can be found in real atoms, such as rubidium or sodium, so a corresponding experiment can be done to observe the expected phenomena related to SGC effect, since no rigorous conditions are required.
The effect of spontaneously generated coherence (SGC) on spontaneous emission and dynamical evolution of a microwave-driven four-level atomic system is studied. Interesting phenomena due to SGC, such as spectral-line narrowing, spectra-line enhancement, spectral-line suppression, and fluorescence quenching, are shown in the spontaneous emission spectra, which can be effectively modulated by amplitude and phase of the microwave field. Due to SGC, the total populations are partly, even completely, trapped in upper levels in steady state, the decay time of which is sensitive to the phase of the microwave field. In the dressed state picture, multiple SGC arise during the process of three close-lying states decaying to the same state. The corresponding experiment to observe the expected phenomena related to SGC can be more conveniently realized in atoms, since no rigorous conditions are required and the amplitude and phase of the microwave field can be conveniently controlled.
The spontaneous emission property of a five-level atom with a loop structure driven by three optical fields and a microwave field is intensively studied. Several quantum interference effects can be observed in the spontaneous emission spectra, such as spectral-line narrowing, spectral-line enhancement, spectral-line suppression, partial cancellation and fluorescence quenching. The number of emission peaks, the positions of dark lines can be controlled by varying the intensities of driving fields or the phase of the microwave field coupling the two lower levels in the atomic system. Furthermore, since no rigorous conditions are required, the expected phenomena may easily be achieved experimentally in atomic systems.