Chinese Optics Letters, Volume. 2, Issue 5, 05302(2004)
Absorption-amplification response with or without spontaneously generated coherence effect in a four-level atomic system
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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Jiahua Li, Wenxing Yang, Jucun Peng, "Absorption-amplification response with or without spontaneously generated coherence effect in a four-level atomic system," Chin. Opt. Lett. 2, 05302 (2004)