,Absorption-Free Sub- and Super-Luminal Light Propagation via Quantum Interference

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We investigate the dispersive and absorptive properties of an N-type four-level atomic system in three coherent fields,and consider the susceptibility mathematically.It is shown that the group velocity of the probe field exhibits sub- and super-luminal under some conditions,meanwhile the absorption coefficient keeps zero during the occurrence and transition process of sub- and super-luminal pulses.
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