Absorption-Amplification Response with or Without Spontaneously Generated Coherence in a Coherent Four-Level Atomic Medium |
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Authors: | LI Jia-Hua YANG Wen-Xing PENG Ju-Cun |
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Affiliation: | Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China;Institute of Physics and Mathematics, the Chinese Academy of Sciences, Wuhan 430071, China Department of Physics, Xiaogan Normal University, Xiaogan 432100, China |
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Abstract: | We discuss and analyze the absorption-amplification properties of a weak probe field in a typical four-level atomic system in the presence of an additional coherence term, the spontaneously generated coherence term. Theinfluences of the spontaneously generated coherence and a coherent pump field on the probe absorption (amplification)are investigated in detail. We show that the absorption of such a weak probe field can be dramatically enhanced dueto the presence of the spontaneously generated coherence. At the same time, the probe-absorption profile exhibitsthe double-peak structure and the probe-absorption peak gradually decreases as the pump intensity increases. On thecontrary, the amplification of such a weak probe field near the line center of the probe transition can be achieved byadjusting the coherent pump field intensity in the absence of the spontaneously generated coherence. |
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Keywords: | spontaneously generated coherence probe absorption probe amplification |
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