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

Laser Physics Letters

Effects of decay-induced coherence and microwave-induced coherence on the index of refraction in a three-level Λ-type atomic system

Weihua Xu, Jin‐Hui Wu, Jin-Yue Gao

Published Mar 9, 2004• 7 citations
Publisher

Abstract

We study the dispersion-absorption properties in a three-level Λ-type atomic system with two closely lying lower levels. We consider two schemes: in the first, the two lower levels are coupled by decay-induced coherence, and in the second, quantum coherence is created by coupling the two lower levels to each other by a microwave field. We found that due to the decay-induced coherence or microwave-induced coherence, the dispersion-absorption properties can be controlled by the relative phase of applied fields, large index of refraction without absorption always can be obtained just by choosing proper values of the relative phase.

DOI
10.1002/lapl.200310046

Related papers

Phase-dependent high refractive index without absorption in a four-level inverted-Y atomic system

Zhiqiang Zeng, Yuping Wang, Fu-Ti Liu +1 more

We consider a closed four-level inverted-Y system in the presence and the absence of a microwave field. It is found that due to the quantum coherence between the two lower levels, either induced by the spontaneous decay or by the microwave field, the refraction – absorption properties of the system can be modulated by controlling the relative phase of the applied fields in both driven ways. In particular, by properly setting the values of the relative phase, the desirable high index of refraction without absorption can be achieved.

Quantum Electronics•Jan 31, 2015•3 citations

Absorption and dispersion of a V-type three-level atom driven by a microwave field

Zeng Zhi

When the two excited levels in a V-type three-level atom are coupled by a microwave field,the quantum coherence is created by the interference between the atomic coupling transition channels.The probe absorption and dispersion properties can be modulated by adjusting the strength of microwave field,and the phenomenon of the high refractive index without absorption appears at the resonance.Besides,the relative phase control of probe gain can be achieved due to the quantum coherence induced by the microwave field.

Journal of Atomic and Molecular Physics•Jan 1, 2013•0 citations

Effects of Vacuum Induced Coherence on the Medium Absorp tion and Dispersion in a Three-level Λ-type System

Hou Bang-pin

Due to the interaction of the vaccum filed with a three-level Λ-type atom,in which its lower levels are neardegenerate,there appears a vacuum induced coherence originating from the interference between the two transitions.The absorption and dispersion of the atomic system is strongly dependent on the vacuum induced coherence.In addition,the atomic optical property is also related to the phase of the external coherent fields due to the existence of the vacuum induced coherence.

Journal of Sichuan Normal University•Jan 1, 2007•0 citations

Phase and amplitude control of atomic grating in a three level closed lambda System

Muhammad Saddique, Asad Mehmood, Sajid Qamar +1 more

Abstract We have theoretically studied the electromagnetically induced grating (EIG) in a three-level closed Λ-type atomic system. The upper level is coupled to the two lower levels via a strong control and a weak probe field. In addition to these two optical fields a weak microwave field is also applied to couple the lower two levels. Our results show that the relative phase of the three fields in the presence of microwave field enhances the dispersion in the medium and consequently provides control over magnitude of the diffraction intensities. We have optimized the system parameters such as strength of the fields and interaction length to attain increased first order diffraction. Furthermore, we have also studied the effects of probe detuning on diffraction intensities. Interestingly, the probe detuning results in suppression of the zeroth order intensity while increasing the higher order intensities.

Physica Scripta•Jun 30, 2021•3 citations

Phase-dependent properties for absorption and dispersion by spontaneously generated coherence in a four-level atomic system

Wei-Hua Xu, Huifang Zhang, Jin-Yue Gao +1 more

A four-level atomic system with two closely lying upper levels driven by two coherent fields is considered. We show that, in the presence of a weak incoherent pump, steady-state gain can be achieved as a result of quantum interference from spontaneous emission. The gain depends on the relative phase between the two fields, so it can be modulated by control of the relative phase. Also, by controlling the relative phase, one can always obtain a large index of refraction with zero absorption.

Journal of the Optical Society of America B•Nov 1, 2003•27 citations

Atomic-coherence-induced enhancement of refractive index

Zhenfei Luo, Zhizhan Xu, Zhou Jiao-yang

The influences of lower-level coherence in atomic medium of Ξ-type energy-level scheme on the absorption and dispersion are studied in dressed states. It is found that a weak probe light of a certain frequency can be free of atomic absorption, and at the same time has a large index of refraction.

Acta Physica Sinica (Overseas Edition)•Apr 1, 1993•0 citations
We study the dispersion-absorption properties in a three-level Λ-type atomic system with two closely lying lower levels. We consider two schemes: in the first, the two lower levels are coupled by decay-induced coherence, and in the second, quantum coherence is created by coupling the two lower levels to each other by a microwave field. We found that due to the decay-induced coherence or microwave-induced coherence, the dispersion-absorption properties can be controlled by the relative phase of applied fields, large index of refraction without absorption always can be obtained just by choosing proper values of the relative phase.
We consider a closed four-level inverted-Y system in the presence and the absence of a microwave field. It is found that due to the quantum coherence between the two lower levels, either induced by the spontaneous decay or by the microwave field, the refraction – absorption properties of the system can be modulated by controlling the relative phase of the applied fields in both driven ways. In particular, by properly setting the values of the relative phase, the desirable high index of refraction without absorption can be achieved.
When the two excited levels in a V-type three-level atom are coupled by a microwave field,the quantum coherence is created by the interference between the atomic coupling transition channels.The probe absorption and dispersion properties can be modulated by adjusting the strength of microwave field,and the phenomenon of the high refractive index without absorption appears at the resonance.Besides,the relative phase control of probe gain can be achieved due to the quantum coherence induced by the microwave field.
Abstract We have theoretically studied the electromagnetically induced grating (EIG) in a three-level closed Λ-type atomic system. The upper level is coupled to the two lower levels via a strong control and a weak probe field. In addition to these two optical fields a weak microwave field is also applied to couple the lower two levels. Our results show that the relative phase of the three fields in the presence of microwave field enhances the dispersion in the medium and consequently provides control over magnitude of the diffraction intensities. We have optimized the system parameters such as strength of the fields and interaction length to attain increased first order diffraction. Furthermore, we have also studied the effects of probe detuning on diffraction intensities. Interestingly, the probe detuning results in suppression of the zeroth order intensity while increasing the higher order intensities.