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Chin. Phys. B, 2012, Vol. 21(6): 064208    DOI: 10.1088/1674-1056/21/6/064208

Modulation of atomic exit and injection rates on the phase-dependent gain without inversion in a Doppler broadened open four-level system

Liu Zhong-Bo(刘中波)a), Jia Ke-Ning (贾克宁)a), Liang Ying(梁颖)a), Tong Dian-Min(仝殿民)b), and Fan Xi-Jun(樊锡君)a)†
a. College of Physics and Electronics, Shandong Normal University, Jinan 250014, China;
b. School of Physics, Shandong University, Jinan 250100, China
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.
Keywords:  open N-type four-level system      spontaneously generated coherence      relative phase      Doppler broadening      gain without inversion  
Received:  12 July 2011      Revised:  14 October 2011      Accepted manuscript online: 
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)  
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11175105).
Corresponding Authors:  Fan Xi-Jun     E-mail:

Cite this article: 

Liu Zhong-Bo(刘中波), Jia Ke-Ning (贾克宁), Liang Ying(梁颖), Tong Dian-Min(仝殿民), and Fan Xi-Jun(樊锡君) Modulation of atomic exit and injection rates on the phase-dependent gain without inversion in a Doppler broadened open four-level system 2012 Chin. Phys. B 21 064208

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