Modulation of atomic exit and injection rates on the phase-dependent gain without inversion in a Doppler broadened open four-level system |
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| Authors: | Liu Zhong-Bo Jia Ke-Ning Liang Ying Tong Dian-Min Fan Xi-Jun |
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| Affiliation: | a. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;b. School of Physics, Shandong University, Jinan 250100, China |
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| Abstract: | It is shown that in a Doppler broadened open N-type four-level atomic system with spontaneously generated coherence (SGC), the gain without inversion (GWI) is very sensitive to the variation of the relative phase between the probe field and the driving field; the atomic exit rate (R0 ) and the ratio (S) of the atomic injection rates have a considerable modulation effect on the phase-dependent GWI. GWI first increases and then decreases with R0 increasing; in a certain value range of S, GWI increases monotonically with S increasing; by adjusting the values of R0 and S, in an open system a much larger GWI can be obtained than in the corresponding closed system 2011 Phys. Rev. A 83 043805]. The modulation effects of R0 and S on the phase-dependent GWI in the case with the counter-propagating probe and driving fields are stronger than those in the co-propagating case, GWI in the co-propagating case is much larger than that in the counter-propagating case. |
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| Keywords: | open N-type four-level system spontaneously generated coherence relative phase Doppler broadening gain without inversion |
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