中国物理B ›› 2004, Vol. 13 ›› Issue (10): 1722-1727.doi: 10.1088/1009-1963/13/10/026
徐卫华1, 张惠芳1, 高锦岳1, 张冰2
Zhang Bing (张冰)abc, Xu Wei-Hua (徐卫华)ab, Zhang Hui-Fang (张惠芳)ab, Gao Jin-Yue (高锦岳)ab
摘要: A four-level system driven by two coherent fields is considered. It is shown that in the presence of an incoherent pump, the probe gain at a short wavelength can be achieved due to the quantum interference. Our density matrix calculation provides the conditions for probe amplification from different origins, including gain without population inversion on any state basis, gain with population inversion on the dressed-state basis, and gain with population inversion on the bare-state basis. Also, by controlling the Rabi frequency of the coupling field a total change from non-inversion to inversion can be achieved which does not depend on the intensity of the incoherent pump.
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