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Gain-assisted superluminal light propagation via incoherent pumping field |
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| Authors: | M Mahmoudi S W Rabiei L Safari M Sahrai |
| Institution: | (1) Department of Physics, Zanjan University, P.O.Box 45195-313, Zanjan, Iran;(2) Department of Physics, University of Kurdistan, Sanandaj, Iran;(3) Research Institute for Applied Physics and Astronomy, University of Tabriz, Tabriz, Iran |
| Abstract: | We investigate the dispersion and the absorption properties of a weak field in a three-level Λ and V-type atomic system. We use just an incoherent pumping field to control the group velocity of a light pulse. The slope of dispersion is shown to be changed from positive to negative just by varying the intensity of the indirect incoherent pumping field. Gain-assisted superluminal light propagation appears in this system. No laser field is used in the pumping processes. |
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