Absorption-Free Sub- and Super-Luminal Light Propagation via Quantum Interference
WU Jian-Chun1,2** , LIU Zheng-Dong1,2 , ZHENG Jun1,2
1 Department of Physics, Nanchang University, Nanchang 3300312 Engineering Research Center for Nanotechnology, Nanchang University, Nanchang 330047
Abstract ：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.
收稿日期: 2012-06-21
出版日期: 2012-10-01
:
42.50.Gy
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
42.25.Bs
(Wave propagation, transmission and absorption)
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2012, Vol. 29 
