Group velocity control in a four level system through interacting dark resonances

Details Group velocity control in a four level system through interacting dark resonances Group velocity control in a four level system through interacting dark resonances

2010-01-09

arxiv.org/abs/1001.1422v1

Physics

Quantum Physics

Scientific paper

We investigate dispersion and absorption properties of a weak probe field in a four level atomic system through interacting dark resonances. We show that two narrow peaks appears in the optical spectra due to the presence of interacting dark resonances. This two narrow peaks leads to the superluminal light propagation with strong absorption. However, if a weak incoherent pump field is exerted to the probe transition, then the peaks structures can be changed such that two absorption peaks transformed to two gain deeps. We Show that both subluminal and superluminal light propagation occur in this system, where controlled by the incoherent pumping strength.

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