a College of Physics, Jilin University, Changchun 130023, Chinab Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Education Ministry of China, China; b Department of Physics, Mudanjiang Teachers' College, Mudanjiang 157012, China
Abstract 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.
Received: 21 July 2003
Revised: 09 January 2004
Accepted manuscript online:
(Coherent control of atomic interactions with photons)
Fund: Project supported by the National Natural Science Foundation of China (Grant No 10334010) and the Doctoral Program Foundation of Institution of Higher Education of China (Grant No 19201038).
Cite this article:
Zhang Bing (张冰), Xu Wei-Hua (徐卫华), Zhang Hui-Fang (张惠芳), Gao Jin-Yue (高锦岳) Quantum interference effects on the probe amplification without and with inversion in a four-level system 2004 Chinese Physics 13 1722
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