Quantum interference effects on the probe amplification without and with inversion in a four-level system |
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| Authors: | Zhang Bing Xu Wei-Hu Zhang Hui-Fang and Gao Jin-Yue |
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| Affiliation: | College of Physics, Jilin University, Changchun 130023, China; Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Education Ministry of China, China; Department of Physics, Mudanjiang Teachers' College, Mudanjiang 157012, China |
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| 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. |
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| Keywords: | quantum interference probe gain inversion non-inversion |
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