| Absorption-amplification response with or withoutspontaneously generated coherence effectin a four-level atomic system |
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| 作者姓名： | 李家华 杨文星 彭菊村 |
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| 作者单位： | Department of Physics，Huazhong University of Science and Technology，Wuhan 430074，Department of Physics，Huazhong University of Science and Technology，Wuhan 430074 Wuhan Institute of Physics and Mathematics，Chinese Academy of Sciences，Wuhan 430071，Department of Physics，Xiaogan Normal University，Xiaogan 432100 |
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| 基金项目： | TheauthorswouldliketothankDr.Y.Wuformanystimulatingdiscussions.ThisworkwassupportedinpartbytheNationalNaturalScienceFoundationofChina(No.90103026and10125419). |
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| 摘 要： | We discuss and analyze the absorption properties of a weak probe field in a typical four-level atomic system in the presence of a spontaneously generated coherence (SGC) term. The influences of the SGC and a coherent pump field on the probe absorption-amplification are investigated. The results show that the absorption of such a weak probe field can be dramatically enhanced due to the SGC effect. At the same time, the probe-absorption profile exhibits a two-peak structure and the probe-absorption peak gradually decreases as the pump intensity increases. On the contrary, the amplification of such a weak probe field near the line center of the probe transition can be achieved by adjusting the coherent pump field intensity in the absence of the SGC effect.
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