Phase control of group velocity: From subluminal to superluminal light propagation

Bortman-Arbiv, D.; Wilson-Gordon, A. D.; Friedmann, H.

doi:10.1103/physreva.63.043818

Cited by 184 publications

(101 citation statements)

References 29 publications

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“…For example, speed control in atomic systems has been achieved by changing the frequencies, amplitudes or phase differences of the applied fields. It has been shown that switching from subluminal to superluminal pulse propagation can be achieved by the intensity of the coupling fields [16,17,18,19], and the relative phase between two weak probe fields [20]. Morigi et al [21] have compared the phase-dependent properties of the ⋄ (diamond) four level system with those of the double Λ system.…”

Section: Introductionmentioning

confidence: 99%

Group velocity control in the ultraviolet domain via interacting dark-state resonances

Mahmoudi

Fleischhaker

Sahrai

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

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Abstract. The propagation of a weak probe field in a laser-driven four-level atomic system is investigated. We choose mercury as our model system, where the probe transition is in the ultraviolet region. A high-resolution peak appears in the optical spectra due to the presence of interacting dark resonances. We show that this narrow peak leads to superluminal light propagation with strong absorption, and thus by itself is only of limited interest. But if in addition a weak incoherent pump field is applied to the probe transition, then the peak structure can be changed such that both sub-and superluminal light propagation or a negative group velocity can be achieved without absorption, controlled by the incoherent pumping strength.Group velocity control in the ultraviolet domain via interacting dark-state resonances 2

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Section: Introductionmentioning

confidence: 99%

Group velocity control in the ultraviolet domain via interacting dark-state resonances

Mahmoudi

Fleischhaker

Sahrai

et al. 2008

J. Phys. B: At. Mol. Opt. Phys.

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“…Most schemes for a speed control in atomic systems involve changing the frequency, amplitude or phase difference of the applied fields. It was shown that switching from subluminal to superluminal pulse propagation can be achieved via the intensity of coupling field [13,14,15,16], and via the relative phase between two weak probe fields [17]. The intensity control of group velocity has been attempted by using a lower level-coupling field in the three-level atomic system [14].…”

Section: Introductionmentioning

confidence: 99%

Light propagation through closed-loop atomic media beyond the multiphoton resonance condition

Mahmoudi

Evers

2006

Phys. Rev. A

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The light propagation of a probe field pulse in a four-level double-lambda type system driven by laser fields that form a closed interaction loop is studied. Due to the finite frequency width of the probe pulse, a time-independent analysis relying on the multiphoton resonance assumption is insufficient. Thus we apply a Floquet decomposition of the equations of motion to solve the timedependent problem beyond the multiphoton resonance condition. We find that the various Floquet components can be interpreted in terms of different scattering processes, and that the medium response oscillating in phase with the probe field in general is not phase-dependent. The phase dependence arises from a scattering of the coupling fields into the probe field mode at a frequency which in general differs from the probe field frequency. We thus conclude that in particular for short pulses with a large frequency width, inducing a closed loop interaction contour may not be advantageous, since otherwise the phase-dependent medium response may lead to a distortion of the pulse shape. Finally, using our time-dependent analysis, we demonstrate that both the closed-loop and the non-closed loop configuration allow for sub-and superluminal light propagation with small absorption or even gain. Further, we identify one of the coupling field Rabi frequencies as a control parameter that allows to conveniently switch between sub-and superluminal light propagation.

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“…It has been (143) demonstrated that the three-level atom soliton can propagate with the velocity of light [15]. The conditions for subluminal to superluminal propagation through the phase control of the group velocity in a V shaped three-level system have been discussed in [17]. Finally, the propagation through an anomalous dispersion medium showed the pulse propagation at a negative group velocity [18,19].…”

Section: Introductionmentioning

confidence: 99%

On the Time Dependent Features of the Two-Colour Light Pulses Propagation in the Sodium Vapour

Alhasan

Fiutak

2006

Acta Phys. Pol. A

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Phase control of group velocity: From subluminal to superluminal light propagation

Cited by 184 publications

References 29 publications

Group velocity control in the ultraviolet domain via interacting dark-state resonances

Group velocity control in the ultraviolet domain via interacting dark-state resonances

Light propagation through closed-loop atomic media beyond the multiphoton resonance condition

On the Time Dependent Features of the Two-Colour Light Pulses Propagation in the Sodium Vapour

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