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

Chinese Journal of Lasers

Investigation of Transient Properties of Electromagnetically Induced Transparency with Different Pump Laser Energy

Xihua Yang

Published Jan 1, 2004• 0 citations
OpenAlex

Abstract

The transient properties of electromagnetically induced transparency (EIT) with different pump laser energies in a Λ-type three-level system are studied by solving the time-dependent matrix equation. The time evolution of the probe laser absorption, the population of the three levels and the coherent term ρ 23 are analyzed. It is shown that transient amplification without inversion can be realized with high pump laser energy and that transient EIT would reduce and transient amplification without inversion would disappear with the decrease of the pump laser energy. Since the probe absorption depends on the product of Rabi frequency of the pump laser and the coherent term ρ 23, the nonzero damping coherent term ρ 23 results in the transient absorption and amplification without inversion at high pump laser energy, and the decrease of the coherence with the decrease of the pump laser energy leads to the disappearance of the amplification and enhancement of absorption.

Related papers

Investigation of Transient Properties of Electromagnetically Induced Transparency in a Λ-Type Three-level System

Huaigang Zhang

The transient properties of electromagnetically induced transparency in a Λ-type three-level system are investigated theoretically.The time-dependent matrix equations are solved by the operational methods of Laplace transform.Under the different initial conditions the evolution of the probe laser Absorption and the population of each level varying with the pump laser energy and the time are analyzed.

宁夏师范学院学报•Jan 1, 2009•0 citations

Investigation of Transient Properties of Electromagnetically Induced Transparency with a Strong Probe Laser

Xihua Yang, Zhenrong Sun, Li Hua +2 more

The transient properties of electromagnetically induced transparency (EIT) are studied with different probe pulse energies for the first time in the 3S 3P 3/2 4D ladder type three level system of sodium atom.The EIT effect would be reduced with the increase of the probe pulse energy. Theoretical calculation is carried out by solving the time dependent matrix equation. The experimental results agree well with the theoretical calculation.

Chinese Journal of Lasers B•Jan 1, 2001•0 citations

Electromagnetically induced transparency in a Λ-type molecular system with permanent dipole moments revisited

Niharika Singh, Q. V. Lawande, Richard D’Souza +1 more

Electromagnetically induced transparency (EIT) in a molecular three-level Λ system with permanent dipole moments and undergoing m- and n-photon transitions by pump and probe lasers is investigated. Analytical expressions are derived for probe absorption spectrum and dispersion for a medium of stationary as well as thermal molecules. Contrary to the earlier study by Zhou et al. [J. Chem. Phys. 131, 034105 (2009)], we observe no amplification in 2 + 2 photon process when the sign of the difference of the permanent moments of the excited and the ground levels is reversed. Reasons for these contrasting observations are discussed. Our study shows that the permanent moments essentially damp the laser-molecule Rabi frequency to result in narrower EIT line width and larger group velocity index. These effects are further enhanced when the order of the multi-photon process is increased. The importance of the virtual mechanism is discussed by considering the special case of 2 + 1 photon EIT.

The Journal of Chemical Physics•Sep 12, 2012•6 citations

Study of Atomic Populations, Electromagnetically Induced Transparency, and Dispersive Signals in a λ-Type System Under Various Decoherence Effects

Rohit Hazra, Md. Mabud Hossain

We have theoretically studied the atomic populations, electromagnetically induced transparency (EIT), and dispersion in a three-level Λ-type system. The density matrix equations are set up with regard for the relaxation of populations of the ground states, and the optical Bloch equations are solved analytically in the weak probe field approximation. Decoherence effects in the ground and excited states on the EIT line shape and dispersive signals are studied, and it is found that the EIT line width increases and the peak height decreases, as the decoherence rates increase in the ground and excited states. On the other hand, we have observed that the dispersive signals are steeper and of high contrast for the lower decoherence rates in the ground and excited states. We have also analyzed the variations of atomic populations of the energy levels at the pump Rabi frequency, as well as the decoherence rate in the ground state.

Ukrainian Journal of Physics•Apr 1, 2019•2 citations

Coherent transient investigation in electromagnetically induced transparency with double windows

Xiaoli Li

A theoretical study of the time-dependent probe response of a single electromagnetically induced transparency(EIT) window to double EIT windows is presented by numerically solving the equations of motion of the density matrix in a quasi-A-four-level configuration.There is a coherent transient process with high quantum beats.This effect can be explained using the dressed state formalism.The quantum beats result from quantum coherence effect between the levels driven by RF field.The results show that when the probe field is on resonance with a bare-state transition,the beat frequency is one-half of RF Rabi frequency in transient absorption response.While the probe field is on resonance with a dressed-state transition,which results from the atom system interaction with strong RF field,the beat frequency equals the RF Rabi frequency in transient absorption response.

Chinese Journal of Quantum Electronics•Jan 1, 2009•0 citations

Study of coherence effects in an inverted Y-type four-level system

Xiaoli Li, Yafang Shi, Lin Liu +6 more

Atomic coherence and interference play an important role in the study of the atom-photon interactions. Electromagnetically induced transparency (EIT) is an extensively studied two-photon coherence phenomenon theoretically as well as experimentally. EIT is mainly observed in three-level atomic systems which causes transparency by quenching absorption of the medium. In this paper, based on the lambda type three-level system including energy level |1>, |2> and |3>, a microwave driving field is introduced between the excited-state energy level |3> and another excited-state energy level |4> to form an inverted Y-type four-level system. We theoretically study the two- and three-photon coherence in this system. The results show that the coupling field makes the probing absorption intensity at the resonant frequency have a very narrow line-width depression, i.e., EIT. The microwave field causes a dynamic Stark splitting of the energy level |3> and induces the Aulter-Townes double peaks. Their frequency interval is exactly equal to the Rabi frequency of the microwave field. The presence of all three fields induces wide window of EIT at the line center owing to the enhanced depression results. The transient evolution is also discussed to understand the optical switching process in the system. Our theoretical study will be helpful to get a deeper insight into the three-photon effects in multilevel systems.

SPIE Conference on Quantum and Nonlinear Optics•Nov 9, 2018•0 citations
The transient properties of electromagnetically induced transparency (EIT) with different pump laser energies in a Λ-type three-level system are studied by solving the time-dependent matrix equation. The time evolution of the probe laser absorption, the population of the three levels and the coherent term ρ 23 are analyzed. It is shown that transient amplification without inversion can be realized with high pump laser energy and that transient EIT would reduce and transient amplification without inversion would disappear with the decrease of the pump laser energy. Since the probe absorption depends on the product of Rabi frequency of the pump laser and the coherent term ρ 23, the nonzero damping coherent term ρ 23 results in the transient absorption and amplification without inversion at high pump laser energy, and the decrease of the coherence with the decrease of the pump laser energy leads to the disappearance of the amplification and enhancement of absorption.
Electromagnetically induced transparency (EIT) in a molecular three-level Λ system with permanent dipole moments and undergoing m- and n-photon transitions by pump and probe lasers is investigated. Analytical expressions are derived for probe absorption spectrum and dispersion for a medium of stationary as well as thermal molecules. Contrary to the earlier study by Zhou et al. [J. Chem. Phys. 131, 034105 (2009)], we observe no amplification in 2 + 2 photon process when the sign of the difference of the permanent moments of the excited and the ground levels is reversed. Reasons for these contrasting observations are discussed. Our study shows that the permanent moments essentially damp the laser-molecule Rabi frequency to result in narrower EIT line width and larger group velocity index. These effects are further enhanced when the order of the multi-photon process is increased. The importance of the virtual mechanism is discussed by considering the special case of 2 + 1 photon EIT.
We have theoretically studied the atomic populations, electromagnetically induced transparency (EIT), and dispersion in a three-level Λ-type system. The density matrix equations are set up with regard for the relaxation of populations of the ground states, and the optical Bloch equations are solved analytically in the weak probe field approximation. Decoherence effects in the ground and excited states on the EIT line shape and dispersive signals are studied, and it is found that the EIT line width increases and the peak height decreases, as the decoherence rates increase in the ground and excited states. On the other hand, we have observed that the dispersive signals are steeper and of high contrast for the lower decoherence rates in the ground and excited states. We have also analyzed the variations of atomic populations of the energy levels at the pump Rabi frequency, as well as the decoherence rate in the ground state.
A theoretical study of the time-dependent probe response of a single electromagnetically induced transparency(EIT) window to double EIT windows is presented by numerically solving the equations of motion of the density matrix in a quasi-A-four-level configuration.There is a coherent transient process with high quantum beats.This effect can be explained using the dressed state formalism.The quantum beats result from quantum coherence effect between the levels driven by RF field.The results show that when the probe field is on resonance with a bare-state transition,the beat frequency is one-half of RF Rabi frequency in transient absorption response.While the probe field is on resonance with a dressed-state transition,which results from the atom system interaction with strong RF field,the beat frequency equals the RF Rabi frequency in transient absorption response.
Atomic coherence and interference play an important role in the study of the atom-photon interactions. Electromagnetically induced transparency (EIT) is an extensively studied two-photon coherence phenomenon theoretically as well as experimentally. EIT is mainly observed in three-level atomic systems which causes transparency by quenching absorption of the medium. In this paper, based on the lambda type three-level system including energy level |1>, |2> and |3>, a microwave driving field is introduced between the excited-state energy level |3> and another excited-state energy level |4> to form an inverted Y-type four-level system. We theoretically study the two- and three-photon coherence in this system. The results show that the coupling field makes the probing absorption intensity at the resonant frequency have a very narrow line-width depression, i.e., EIT. The microwave field causes a dynamic Stark splitting of the energy level |3> and induces the Aulter-Townes double peaks. Their frequency interval is exactly equal to the Rabi frequency of the microwave field. The presence of all three fields induces wide window of EIT at the line center owing to the enhanced depression results. The transient evolution is also discussed to understand the optical switching process in the system. Our theoretical study will be helpful to get a deeper insight into the three-photon effects in multilevel systems.