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 Natural Science of Heilongjiang University

Study on optical bistability in a four-level inverted Y-type atom system

Hua Xua

Published Jan 1, 2014• 0 citations
OpenAlex

Abstract

Optical bistability in a four-level inverted Y-type atom system inside an optical ring cavity is investigated numerically. Atomic density matrix equations are derived by the density matrix theory. The effect of the Spontaneously Generated Coherence( SGC) on threshold of the optical bistability is studied.When the probing field and controlling field are in two-photon resonance,the atoms are trapped on the two lower states,probing field is transparent and there is no bistability in the system. But when the probing field and coupling field or coupling field and controlling field are in two-photon resonance,there is the optical bistability in the system. Under condition of the stable state,SGC can make the interference destructive from two transition channels. Population distribution on the higher levels is enhanced,transparency window becomes narrow,and the threshold of the bistability becomes large.

Related papers

Optical bistability via quantum interference in a four-level atomic medium

Xin‐You Lü, Jiahua Li, Ji-Bing Liu +1 more

We theoretically investigate optical bistability (OB) behaviour in a four-level atomic system confined in a unidirectional ring cavity. It is shown that OB can be controlled by adjusting the intensity of the coupling field and the value of the cooperativity parameter. More importantly, our numerical results show that the threshold intensity of OB can be reduced without decreasing the range of the hysteresis loop via adjusting the effect of spontaneously generated coherence (SGC) or the relative phase between two applied fields. The influence of the frequency detuning of the coupling field on the OB behaviour is also discussed.

Journal of Physics B Atomic Molecular and Optical Physics•Nov 29, 2006•68 citations

Study on optical bistability in an atom optomechanical cavity hybrid system

GE Ya

Optical bistability in a hybrid system consisting of cavity optomechanical and a four-level inverted Y-type atom is investigated numerically. Steady state solution of Heisenberg-Langevin equation is derived. When the configuration condition of the system in electromagnetically induced transparency( EIT) is satisfied and is not satisfied,the thresholds of optical bistability are studied respectively. When EIT condition is not satisfied,the up-threshold of bistability is adjustable while the down-threshold remains the same one. On the contrary,when EIT condition is satisfied,the up-threshold of bistability remains the same one while the down-threshold is adjustable. When the atom system is under the condition of EIT configuration,bistability can be achieved more easily than which is not under the condition of EIT configuration. Furthermore,after the system reaches the up-threshold,no matter the condition of EIT configuration is satisfied or not,the curve of bistability becomes a linear with the intensity of driving field.

Journal of Natural Science of Heilongjiang University•Jan 1, 2015•0 citations

Bistable behaviors of weak probe light via coherent and incoherent fields

Hossein Jafarzadeh, Elnaz Ahmadi Sangachin, Seyyed Hossein Asadpour

In this paper, the bistable behaviors of weak probe light in a unidirectional ring cavity with a four-level atomic system are discussed. We find that in the presence of spontaneously generated coherence (SGC), the medium is completely phase dependent and the intensity threshold of optical bistability can be controlled. The effect of an incoherent pumping field on optical bistability in the presence and absence of SGC is also analyzed. Moreover, the group index behavior of weak probe light is investigated. We show that the intensity threshold of optical bistability can be controlled by light propagation switching from slow to fast by different parameters of the atomic medium.

Canadian Journal of Physics•Feb 27, 2015•1 citation

Effects of Spontaneously Generated Coherence on Absorption in Probe Laser in Four-level Y-type Atomic System

Ketao Liu

This paper investigates the effects of spontaneously generated coherence(SGC) on the probe absorption in the Y-type four-level atomic system driven by three fields.It finds that the probe absorption at the resonance center shows the different phenomena with the SGC effects.When SGC produces the destructive interference on the probe absorption,the absorption at the resonance center is reduced with the SGC enhancement and the gain appears there.When SGC produces the constructive interference on the probe absorption,the absorption at the resonance center is enhanced with the SGC enhancement.That is electromagnetically induced absorption(being abbreviated EIA);the intensity of double electromagnetically induced transparency(being abbreviated EIT);at both sides of the resonance is increased,and the windows get wider.At the same time,the linewidth of the absorption at the resonance center becomes narrow and the transparent windows at both sides of the resonance get wider when the spontaneous decay rate of energy levels |3〉→|2〉 and 4〉→|2〉 is decreased at the ratio of the spontaneous decay rate of energy levels |3〉→|2〉 and |4〉→|2〉 being constant.

Acta Sinica Quantum Optica•Jan 1, 2012•0 citations

Optical switching, bistability and pulse propagation in five-level quantum schemes

Hamid Reza Hamedi

Abstract We explore the effect of a control field on the optical properties of a probe field in five-level inverted Y-type atom–light coupling schemes. While in the absence of the control field, it is discovered that the system is opaque for the probe field. When the control field is turned on, the medium switches to transparency for the probe field. In addition to analytical solutions, numerical results are given in terms of a Gaussian intensity profile of the probe field to elucidate such optical switching. Considering all orders of the probe field, we also study the absorption features of the atomic medium in a unidirectional ring cavity, giving rise to optical bistability. It is shown that in this model, the OB threshold can be controlled by both the control field intensity as well as probe field detuning.

Laser Physics•Apr 21, 2017•17 citations

Effect of Quantum Interference from Incoherent Pumping Field and Spontaneous Emission on Controlling the Optical Bistability and Multi-Stability

Hamid Reza Hamedi, Ali Sari, Mostafa Sahrai +1 more

Optical bistability (OB) and optical multi-stability (OM) of a four-level Λ-type atomic system with two fold lower levels inside a unidirectional ring cavity is investigated. The effect of quantum interference arising from spontaneous emission and incoherent pumping on OB and OM is discussed. It is found that the threshold of OB and OM can be controlled by quantum interference mechanisms. In addition intensity of coupling field and the rate of an incoherent pumping field on behavior of OB and OM are then discussed.

Communications in Theoretical Physics•Feb 1, 2013•7 citations
Optical bistability in a four-level inverted Y-type atom system inside an optical ring cavity is investigated numerically. Atomic density matrix equations are derived by the density matrix theory. The effect of the Spontaneously Generated Coherence( SGC) on threshold of the optical bistability is studied.When the probing field and controlling field are in two-photon resonance,the atoms are trapped on the two lower states,probing field is transparent and there is no bistability in the system. But when the probing field and coupling field or coupling field and controlling field are in two-photon resonance,there is the optical bistability in the system. Under condition of the stable state,SGC can make the interference destructive from two transition channels. Population distribution on the higher levels is enhanced,transparency window becomes narrow,and the threshold of the bistability becomes large.
We theoretically investigate optical bistability (OB) behaviour in a four-level atomic system confined in a unidirectional ring cavity. It is shown that OB can be controlled by adjusting the intensity of the coupling field and the value of the cooperativity parameter. More importantly, our numerical results show that the threshold intensity of OB can be reduced without decreasing the range of the hysteresis loop via adjusting the effect of spontaneously generated coherence (SGC) or the relative phase between two applied fields. The influence of the frequency detuning of the coupling field on the OB behaviour is also discussed.
Optical bistability in a hybrid system consisting of cavity optomechanical and a four-level inverted Y-type atom is investigated numerically. Steady state solution of Heisenberg-Langevin equation is derived. When the configuration condition of the system in electromagnetically induced transparency( EIT) is satisfied and is not satisfied,the thresholds of optical bistability are studied respectively. When EIT condition is not satisfied,the up-threshold of bistability is adjustable while the down-threshold remains the same one. On the contrary,when EIT condition is satisfied,the up-threshold of bistability remains the same one while the down-threshold is adjustable. When the atom system is under the condition of EIT configuration,bistability can be achieved more easily than which is not under the condition of EIT configuration. Furthermore,after the system reaches the up-threshold,no matter the condition of EIT configuration is satisfied or not,the curve of bistability becomes a linear with the intensity of driving field.
In this paper, the bistable behaviors of weak probe light in a unidirectional ring cavity with a four-level atomic system are discussed. We find that in the presence of spontaneously generated coherence (SGC), the medium is completely phase dependent and the intensity threshold of optical bistability can be controlled. The effect of an incoherent pumping field on optical bistability in the presence and absence of SGC is also analyzed. Moreover, the group index behavior of weak probe light is investigated. We show that the intensity threshold of optical bistability can be controlled by light propagation switching from slow to fast by different parameters of the atomic medium.
This paper investigates the effects of spontaneously generated coherence(SGC) on the probe absorption in the Y-type four-level atomic system driven by three fields.It finds that the probe absorption at the resonance center shows the different phenomena with the SGC effects.When SGC produces the destructive interference on the probe absorption,the absorption at the resonance center is reduced with the SGC enhancement and the gain appears there.When SGC produces the constructive interference on the probe absorption,the absorption at the resonance center is enhanced with the SGC enhancement.That is electromagnetically induced absorption(being abbreviated EIA);the intensity of double electromagnetically induced transparency(being abbreviated EIT);at both sides of the resonance is increased,and the windows get wider.At the same time,the linewidth of the absorption at the resonance center becomes narrow and the transparent windows at both sides of the resonance get wider when the spontaneous decay rate of energy levels |3〉→|2〉 and 4〉→|2〉 is decreased at the ratio of the spontaneous decay rate of energy levels |3〉→|2〉 and |4〉→|2〉 being constant.
Abstract We explore the effect of a control field on the optical properties of a probe field in five-level inverted Y-type atom–light coupling schemes. While in the absence of the control field, it is discovered that the system is opaque for the probe field. When the control field is turned on, the medium switches to transparency for the probe field. In addition to analytical solutions, numerical results are given in terms of a Gaussian intensity profile of the probe field to elucidate such optical switching. Considering all orders of the probe field, we also study the absorption features of the atomic medium in a unidirectional ring cavity, giving rise to optical bistability. It is shown that in this model, the OB threshold can be controlled by both the control field intensity as well as probe field detuning.
Optical bistability (OB) and optical multi-stability (OM) of a four-level Λ-type atomic system with two fold lower levels inside a unidirectional ring cavity is investigated. The effect of quantum interference arising from spontaneous emission and incoherent pumping on OB and OM is discussed. It is found that the threshold of OB and OM can be controlled by quantum interference mechanisms. In addition intensity of coupling field and the rate of an incoherent pumping field on behavior of OB and OM are then discussed.