Influence of Doppler broadening and spontaneously generated coherence on propagation effect in a quasi lambda-type four-level system

doi:10.1088/1674-1056/21/2/024206

中国物理B ›› 2012, Vol. 21 ›› Issue (2): 24206-024206.doi: 10.1088/1674-1056/21/2/024206

刘中波,梁颖,贾克宁,樊锡君

收稿日期:2010-08-05 修回日期:2011-09-04 出版日期:2012-01-30 发布日期:2012-01-30
通讯作者: 樊锡君,xjfan108@yahoo.com.cn E-mail:xjfan108@yahoo.com.cn

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

Received:2010-08-05 Revised:2011-09-04 Online:2012-01-30 Published:2012-01-30
Contact: Fan Xi-Jun,xjfan108@yahoo.com.cn E-mail:xjfan108@yahoo.com.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 10875072).

摘要/Abstract

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.

Key words: four-level system, propagation effect, spontaneously generated coherence, Doppler broadening, lasing without inversion

中图分类号: (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)

42.50.Gy

42.50.Nn (Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)

刘中波,梁颖,贾克宁,樊锡君. [J]. 中国物理B, 2012, 21(2): 24206-024206.

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[J]. Chin. Phys. B, 2012, 21(2): 24206-024206.

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Influence of Doppler broadening and spontaneously generated coherence on propagation effect in a quasi lambda-type four-level system

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