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Chin. Phys. B, 2012, Vol. 21(2): 024206    DOI: 10.1088/1674-1056/21/2/024206
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Influence of Doppler broadening and spontaneously generated coherence on propagation effect in a quasi lambda-type four-level system

Liu Zhong-Bo(刘中波), Liang Ying(梁颖), Jia Ke-Ning(贾克宁), and Fan Xi-Jun(樊锡君)
College of Physics and Electronics, Shandong Normal University, Jinan 250014, China
Abstract  In this paper we study influences of Doppler broadening, spontaneously generated coherence, and other system parameters on propagation effect in a quasi lambda-type four-level atomic system. It is shown that when the Doppler broadening is present, generally speaking, the values of gain and intensity of lasing without inversion (i.e. the probe field) in the co-propagating probe and driving fields case are much larger than those in the counter-propagating case; considerably larger gain and intensity of lasing without inversion than those without the Doppler broadening can be obtained by choosing appropriate values of the Doppler broadening width and spontaneously generated coherence strength. The gain and intensity of lasing without inversion increase with the increase of spontaneously generated coherence strength; when spontaneously generated coherence is present, much larger gain and intensity of lasing without inversion than those in the case without spontaneously generated coherence can be obtained. Choosing suitable values of the probe detuning, Rabi frequencies of the driving and pump fields at the entrance of the medium also can remarkably enhance the gain and intensity of lasing without inversion.
Keywords:  four-level system      propagation effect      spontaneously generated coherence      Doppler broadening      lasing without inversion  
Received:  05 August 2010      Revised:  04 September 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. 10875072).
Corresponding Authors:  Fan Xi-Jun,xjfan108@yahoo.com.cn     E-mail:  xjfan108@yahoo.com.cn

Cite this article: 

Liu Zhong-Bo(刘中波), Liang Ying(梁颖), Jia Ke-Ning(贾克宁), and Fan Xi-Jun(樊锡君) Influence of Doppler broadening and spontaneously generated coherence on propagation effect in a quasi lambda-type four-level system 2012 Chin. Phys. B 21 024206

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