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

Physical Review A

Velocity-selective effect and its use in refractive index control by an incoherent pumping in a V-type electromagnetically-induced-transparency medium

Luming Li, Wenzhuo Tang, Hong Mei Guo

Published Nov 30, 2007• 3 citations
Publisher

Abstract

Refractive index control and its relevance to the velocity-selective effect generated by the propagation direction of the incoherent pumping field are studied in an open V-type atomic system. The velocity-selective effect on electromagnetically-induced transparency (EIT) is presented in theory and verified in the experiment. It shows that, in contrast to the case of copropagation, counter-propagation of the incoherent pumping field has an absolutely opposite effect on the dispersion of the V-type EIT system. The experimental results are in good agreement with the theoretical analysis.

DOI
10.1103/physreva.76.053837

Related papers

Electromagnetically-Induced-Transparency Effect in a V-type Medium Controlled by an Incoherent Pumping Field

Wenzhuo Tang, Luming Li, Hong Mei Guo

The electromagnetically induced transparency effect in a V-type medium controlled by an incoherent pumping field is studied both experimentally and theoretically, which shows that different propagation directions have absolutely opposite effect [1].

Slow and Fast Light (SL)•Jan 1, 2008•0 citations

Control of light in an M-type five-level atomic system

Luming Li, Hong Mei Guo, Feng Xiao +2 more

An M-type five-level atomic model is proposed to achieve a large index of refraction with vanishing absorption. We present a novel model, to our knowledge, in theoretical analysis, in which an incoherent pumping rate is adopted to simplify the M-type five-level system to be an equivalent four-level system. The theoretical and experimental results show that, by adjustment of the intensity of the incoherent pump, lower group velocity (than that obtained in a conventional Lambda-type three-level electromagnetically induced transparency system) is obtained in cesium atomic vapor. Moreover, a saturation limit for the group velocity is also presented. The experimental results show good agreement with the theoretical analysis.

Journal of the Optical Society of America B•Jun 1, 2005•30 citations

Electromagnetically induced transparency in an open V-type molecular system

Angelos Lazoudis, Teodora Kirova, Ergin H. Ahmed +3 more

We report the experimental observation of electromagnetically induced transparency (EIT) in an inhomogeneously broadened V-type Na${}_{2}$ molecular system. The experiment is performed with both co- and counterpropagating arrangements for the propagation directions of the coupling and probe laser beams. In our theoretical model we employ the density matrix formalism, as well as perturbative methods for obtaining the probe field absorption profile for both open and closed systems. Simulations of the experimental data show excellent agreement with the predictions derived from the basic theory. Our fluorescent intensity measurements show that, in the copropagating configuration, the EIT plus saturation window depth is about $95%$, while under similar conditions in the counterpropagating geometry we observed $40%$--$45%$ reduction in the fluorescence signal around the line center. To separate the two simultaneously occurring mechanisms in a V-type system (i.e., EIT and saturation) that are induced by the coupling field, we have carried out theoretical calculations which show that, in the copropagating case, a significant fraction of the depth of the dip is due to the coherent effect of EIT. When the coupling and probe beams are in the counterpropagating configuration, the dip is mostly due to saturation effects alone.

Physical Review A•Jun 27, 2011•63 citations

A study on electromagnetically induced transparency and velocity selective optically pumped absorption in an eight-level inverted Y-type atomic system

Arindam Ghosh, Khairul Islam, Suman Mondal +3 more

Abstract Coherent probe field (L A ) propagation through an eight-level inverted Y-type atomic system, in the presence of two additional coherent radiation fields termed the field L C (control or pump field) and the field L B (repump field), is investigated by using the parameters of 87 Rb 5 S 1 / 2 → 5 P 3 / 2 → 7 S 1 / 2 transitions. The system has two ground energy levels, four intermediate energy levels, and two uppermost energy levels. A theoretical model based on the density matrix method is used for numerical simulation of the probe response under different conditions. Simulated probe absorption spectra under a Doppler-free condition as well as under thermal averaging exhibit electromagnetically induced transparency (EIT). The position and line shape of this EIT profile change with different detunings of the control and repump fields. When the three coherent fields share a common level, a funnel-like EIT window appears in the simulated probe absorption curve. Velocity selective optically pumped absorption peaks are seen in the simulated probe response at room temperature.

Journal of Physics B Atomic Molecular and Optical Physics•May 22, 2018•10 citations

Enhancement of electromagnetically induced transparency in room temperature alkali metal vapor

O. S. Mishina, Michael S. Scherman, Pietro Lombardi +6 more

Electromagnetically induced transparency (EIT) has led to several quantum optics effects such as lasing without inversion or squeezed light generation. More recently quantum memories based on EIT have been experimentally implemented in different systems such as alkali metal atoms. In this system the excited state of the optical transition splits into several sublevels due to the hyperfine interaction. However, most of the theoretical models used to describe the experimental results are based on a Λ-system with only one excited state. In this article, we present a theoretical model for the Λ-type interaction of two light, fields and an atomic system with multiple excited state. In particular we show that if the control and probe fields are orthogonally circularly polarized the EIT effect in an alkali-metal vapor can almost disappears. We also identify the reasons of this reduction and propose a method to recover the transparency via velocity selective optical pumping.

Optics and Spectroscopy•Oct 1, 2011•3 citations

Enhancement of Electromagnetically Induced Transparency in Room Temperature Alkali Metal Vapor1

O. S. Mishinaa

Electromagnetically induced transparency (EIT) has led to several quantum optics effects such as lasing without inversion or squeezed light generation. More recently quantum memories based on EIT have been experimentally implemented in different systems such as alkali metal atoms. In this system the excited state of the optical transition splits into several sublevels due to the hyperfine interaction. However, most of the theoretical models used to describe the experimental results are based on a system with only one excited state. In this article, we present a theoretical model for the type interaction of two light, fields and an atomic system with multiple excited state. In particular we show that if the control and probe fields are orthogonally circularly polarized the EIT effect in an alkali metal vapor can almost disappears. We also iden tify the reasons of this reduction and propose a method to recover the transparency via velocity selective opti cal pumping. DOI: 10.1134/S0030400X1111021X Λ Λ COHERENT EFFECTS IN OPTICAL AND ATOMIC–MOLECULAR PROCESSES

•Jan 1, 2011•0 citations
Refractive index control and its relevance to the velocity-selective effect generated by the propagation direction of the incoherent pumping field are studied in an open V-type atomic system. The velocity-selective effect on electromagnetically-induced transparency (EIT) is presented in theory and verified in the experiment. It shows that, in contrast to the case of copropagation, counter-propagation of the incoherent pumping field has an absolutely opposite effect on the dispersion of the V-type EIT system. The experimental results are in good agreement with the theoretical analysis.
An M-type five-level atomic model is proposed to achieve a large index of refraction with vanishing absorption. We present a novel model, to our knowledge, in theoretical analysis, in which an incoherent pumping rate is adopted to simplify the M-type five-level system to be an equivalent four-level system. The theoretical and experimental results show that, by adjustment of the intensity of the incoherent pump, lower group velocity (than that obtained in a conventional Lambda-type three-level electromagnetically induced transparency system) is obtained in cesium atomic vapor. Moreover, a saturation limit for the group velocity is also presented. The experimental results show good agreement with the theoretical analysis.
We report the experimental observation of electromagnetically induced transparency (EIT) in an inhomogeneously broadened V-type Na2{}_{2}2​ molecular system. The experiment is performed with both co- and counterpropagating arrangements for the propagation directions of the coupling and probe laser beams. In our theoretical model we employ the density matrix formalism, as well as perturbative methods for obtaining the probe field absorption profile for both open and closed systems. Simulations of the experimental data show excellent agreement with the predictions derived from the basic theory. Our fluorescent intensity measurements show that, in the copropagating configuration, the EIT plus saturation window depth is about 9595%95, while under similar conditions in the counterpropagating geometry we observed 4040%40--4545%45 reduction in the fluorescence signal around the line center. To separate the two simultaneously occurring mechanisms in a V-type system (i.e., EIT and saturation) that are induced by the coupling field, we have carried out theoretical calculations which show that, in the copropagating case, a significant fraction of the depth of the dip is due to the coherent effect of EIT. When the coupling and probe beams are in the counterpropagating configuration, the dip is mostly due to saturation effects alone.
Abstract Coherent probe field (L A ) propagation through an eight-level inverted Y-type atomic system, in the presence of two additional coherent radiation fields termed the field L C (control or pump field) and the field L B (repump field), is investigated by using the parameters of 87 Rb 5 S 1 / 2 → 5 P 3 / 2 → 7 S 1 / 2 transitions. The system has two ground energy levels, four intermediate energy levels, and two uppermost energy levels. A theoretical model based on the density matrix method is used for numerical simulation of the probe response under different conditions. Simulated probe absorption spectra under a Doppler-free condition as well as under thermal averaging exhibit electromagnetically induced transparency (EIT). The position and line shape of this EIT profile change with different detunings of the control and repump fields. When the three coherent fields share a common level, a funnel-like EIT window appears in the simulated probe absorption curve. Velocity selective optically pumped absorption peaks are seen in the simulated probe response at room temperature.
Electromagnetically induced transparency (EIT) has led to several quantum optics effects such as lasing without inversion or squeezed light generation. More recently quantum memories based on EIT have been experimentally implemented in different systems such as alkali metal atoms. In this system the excited state of the optical transition splits into several sublevels due to the hyperfine interaction. However, most of the theoretical models used to describe the experimental results are based on a Λ-system with only one excited state. In this article, we present a theoretical model for the Λ-type interaction of two light, fields and an atomic system with multiple excited state. In particular we show that if the control and probe fields are orthogonally circularly polarized the EIT effect in an alkali-metal vapor can almost disappears. We also identify the reasons of this reduction and propose a method to recover the transparency via velocity selective optical pumping.
Electromagnetically induced transparency (EIT) has led to several quantum optics effects such as lasing without inversion or squeezed light generation. More recently quantum memories based on EIT have been experimentally implemented in different systems such as alkali metal atoms. In this system the excited state of the optical transition splits into several sublevels due to the hyperfine interaction. However, most of the theoretical models used to describe the experimental results are based on a system with only one excited state. In this article, we present a theoretical model for the type interaction of two light, fields and an atomic system with multiple excited state. In particular we show that if the control and probe fields are orthogonally circularly polarized the EIT effect in an alkali metal vapor can almost disappears. We also iden tify the reasons of this reduction and propose a method to recover the transparency via velocity selective opti cal pumping. DOI: 10.1134/S0030400X1111021X Λ Λ COHERENT EFFECTS IN OPTICAL AND ATOMIC–MOLECULAR PROCESSES