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Observation of slow light and superluminal in Cs atomic vapor

Yundong Zhang, Shuangqiang Liu, Hao Wu +2 more

Slow light and superluminal were both observed in Cs atomic vapor without any couple field. By only changing the signal modulate frequency, the light propagation changes from superluminal to slow light.

Advances in Optical Sciences CongressJan 1, 20090 citations

Slow light propagation in an atomic vapour under conditions of amplification without inversion

Kyoung-Dae Kim, Feng Xiao, Chung Hee Lee +3 more

We report experimental results on slowing a light pulse in a system for amplification without inversion (AWI). We were able to control a subluminal group velocity continuously from V g = c /2850 to c /7260 by just changing an incoherent pumping beam power from 0 to 12 mW in the AWI system. And several advantages, such as the controllable delay time and the pulse amplification, for slowing of the light in the AWI system compared to in an electromagnetically induced transparency system were found.

Journal of Physics B Atomic Molecular and Optical PhysicsJun 10, 200314 citations

Slow and superluminal light in semiconductor optical amplifiers

Alexander V. Uskov, Connie J. Chang-Hasnain

An effective mechanism to achieve slow and superluminal light can be achieved in semiconductor optical amplifiers via wave mixing processes due to nonzero linewidth enhancement factor.

Electronics LettersAug 4, 200542 citations

Tunable Slow Light in Cesium Vapor

Aaron Schweinsberg, Ryan M. Camacho, Michael Vern Pack +2 more

We obtain large fractional pulse delays in a Cesium vapor for a probe centered between two absorption resonances in the hyperfine structure. This delay can be tuned by applying pump fields to the absorption lines.

Frontiers in OpticsJan 1, 20060 citations

Fast light in atomic media

A. M. Akulshin, Russell McLean

Atomic media have played a major role in studies of fast light. One of their attractive features is the ability to manipulate experimental parameters to control the dispersive properties that determine the group velocity of a propagating light pulse. We give an overview of the experimental methods, based on both linear and nonlinear atom-light interaction, that have produced superluminal propagation in atomic media, and discuss some of the significant theoretical contributions to the issues of pulse preservation and reconciling faster-than-light propagation and the principle of causality. The comparison of storage of light, enhanced Kerr nonlinearity and efficient wave mixing processes in slow and fast light atomic media illustrates their common and distinct features.Atomic media have played a major role in studies of fast light. One of their attractive features is the ability to manipulate experimental parameters to control the dispersive properties that determine the group velocity of a propagating light pulse. We give an overview of the experimental methods, based on both linear and nonlinear atom-light interaction, that have produced superluminal propagation in atomic media, and discuss some of the significant theoretical contributions to the issues of pulse preservation and reconciling faster-than-light propagation and the principle of causality. The comparison of storage of light, enhanced Kerr nonlinearity and efficient wave mixing processes in slow and fast light atomic media illustrates their common and distinct features.

Journal of OpticsSep 24, 201063 citations

Superluminal propagation of pulsed pseudo-thermal light in atomic vapor

In‐Ho Bae, Young‐Wook Cho, Hee Jung Lee +2 more

We report an experimental demonstration of slow and superluminal propagation of pseudo-thermal (chaotic) light in the Λ-type system of the 5S(1/2)-5P(1/2) transition of (87)Rb atom. The slowed propagation of pulsed pseudo-thermal light was demonstrated in an electromagnetically-induced transparency medium while the superluminal propagation was demonstrated with the enhanced absorption scheme where the coupling field takes the form of a standing wave.We have also demonstrated that the photon number statistics of the pseudo-thermal light is preserved for both the subluminal and superluminal cases.We report an experimental demonstration of slow and superluminal propagation of pseudo-thermal (chaotic) light in the Λ-type system of the 5S(1/2)-5P(1/2) transition of (87)Rb atom. The slowed propagation of pulsed pseudo-thermal light was demonstrated in an electromagnetically-induced transparency medium while the superluminal propagation was demonstrated with the enhanced absorption scheme where the coupling field takes the form of a standing wave.We have also demonstrated that the photon number statistics of the pseudo-thermal light is preserved for both the subluminal and superluminal cases.

Optics ExpressSep 1, 20104 citations

Enhanced effects on slow light and superluminal propagation in cesium vapor

Abstract

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Enhanced effects on slow light and superluminal propagation in cesium vapor

Abstract

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