Slow light amplification in a three-level cascade-type system via spontaneously generated coherence and incoherent pumping

Anh, Le Nguyen Mai; Bang, Nguyen Huy; Phu, Nguyen Van; Dong, Hoang Minh; Hien, Nguyen Thi Thu; Doai, Le Van

doi:10.1007/s11082-022-04521-x

Cited by 7 publications

(5 citation statements)

References 30 publications

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“…Under conditions of EIT and EIA, numerous theoretical and experimental studies have explored the subluminal and superluminal propagation of light [16,17]. Besides that, some studies have focused on the dynamic switching between subluminal and superluminal light propagation within an atomic medium, achieved by manipulating factors like frequency, intensity, phase, and polarization of applied fields [18][19][20]. More recently, research endeavors have honed utilizing an external magnetic field to control EIT [21,22], pulse propagation, and all-optical switching [23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field

Tuan,

Doan,

Huy

et al. 2024

Laser Phys. Lett.

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We proposed a simple model for investigating subluminal and superluminal light propagation via an external magnetic field in an inhomogeneously broadened degenerate two-level atomic medium. We show that a magnetic field can be utilized as a knob to control the absorption/dispersion properties and group index of the medium. By changing the magnitude and reversing the direction of the magnetic field, the positive group index is converted to the negative group index at the center of the EIT window, corresponding with the propagation of a weak light pulse from subluminal to superluminal. Moreover, the influence of the Doppler broadening effect on the group index is also included, making the results approach to actual conditions. Therefore, the suggested model may be helpful for the application realization of optical storage in quantum computers and quantum information processing.

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Section: Introductionmentioning

confidence: 99%

Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field

Tuan,

Doan,

Huy

et al. 2024

Laser Phys. Lett.

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“…On this basis, extremely slow or superluminal light pulses were obtained in the EIT [7][8][9] or EIA [10][11][12] regime, respectively. In particular, some recent studies have shown that it is possible to switch between EIT and EIA modes [13] and thus can switch between fast light and slow light by external fields such as using microwave field [14], standing-wave field [15], Kerr field [16][17][18], coherent pump field [19,20], incoherent pump field [21][22][23], static magnetic field [24,25], or using other coherence effects such as spontaneously generated coherence [22,23,[26][27][28][29] and the phase of applied laser fields [30,31] and so on.…”

Section: Introductionmentioning

confidence: 99%

Switching between slow light and fast light by static magnetic field in a degenerate four-level atomic system at room temperature

Van Phu,

Bang,

Nga

et al. 2024

J. Opt.

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The optical response of a magnetic-degenerated four-level atom system to the two left and right circular polarization components of the probe field is represented at room temperature. The absorption spectrum and group index for the two polarization components of the probe field are controlled according to the static magnetic field and the coupling field under electromagnetically induced transparency (EIT) condition. By varying the strength of the static magnetic field, the optical response of the atomic medium can be changed from transparency to absorption or vice versa and hence the amplitude of group index also changes from positive extreme to negative extreme or vice versa. The same phenomenon also occurs when changing the coupling field intensity. In addition, temperature also significantly influence on the optical response of the atomic medium, which changes not only the amplitude but also the sign of the group index as the temperature increases.

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“…The studies revealed that under the effect of SGC, the absorption is much reduced and within the EIT window slope of the normal dispersion is steeper. These properties of SGC endow remarkable applications of pulse propagation from superluminal to subluminal regime 27 , giant Kerr nonlinearity with minimum absorption 28 , all-optical switching and solitonic pulse propagation with the development of optical communication 29 , 30 , entanglement 16 etc. In 2015, Chen et al .…”

Section: Introductionmentioning

confidence: 99%

Controlling behaviour of transparency and absorption in three-coupled multiple quantum wells via spontaneously generated coherence

Mukherjee,

Hazra,

Borgohain

2024

Sci Rep

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This article presents a coherent phenomenon called spontaneously generated coherence (SGC) under the regime of electromagnetically induced transparency (EIT) in a three-coupled multiple quantum wells. We demonstrate that the presence of SGC in these quantum wells lead to intriguing modifications in the transparency window within the absorption spectrum. At the same time, modification of the dispersive nature is also demonstrated which enables the feasibility of the system in diverse applications based on light propagation. The absorption and dispersion responses are found to be varied by the individual strength of the first and second control fields in presence as well as in absence of SGC in the EIT regime. The positional shifting of the transparency window and simultaneous modifications in the dispersive profiles by tuning the control field detunings of both the first and second control fields are also revealed. Some absorption and dispersion contours are illustrated for getting better insights into the modifications of the optical responses via SGC. Finally, by manipulating the strength of the SGC parameter, we observe the changes in the respective position of the transparency window and dispersion curve. It is expected that the current investigations will pave novel ways for innovative applications in quantum communications, and fabrication of advanced photonic devices.

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Slow light amplification in a three-level cascade-type system via spontaneously generated coherence and incoherent pumping

Cited by 7 publications

References 30 publications

Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field

Knob of adjusting light group velocity in an inhomogeneously broadened degenerate two-level atomic medium by a magnetic field

Switching between slow light and fast light by static magnetic field in a degenerate four-level atomic system at room temperature

Controlling behaviour of transparency and absorption in three-coupled multiple quantum wells via spontaneously generated coherence

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