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Effect of SGC on transient evolution of GWI in a Doppler broadened quasi Λ-type four-level system
引用本文:刘中波,仝殿民,樊锡君.Effect of SGC on transient evolution of GWI in a Doppler broadened quasi Λ-type four-level system[J].光电子快报,2012,8(5):393-396.
作者姓名:刘中波  仝殿民  樊锡君
作者单位:College of Physics and Electronics,Shandong Normal University;School of Physics,Shandong University
基金项目:supported by the National Natural Science Foundation of China (No.11175105)
摘    要:In this paper,we study the effect of spontaneously generated coherence(SGC) on transient evolution of gain without inversion(GWI) in a Doppler broadened quasi Λ-type four-level atomic system.It is shown that transient evolution of GWI is very sensitive to the variation of SGC strength,and the transient maximum value and steady value of GWI both increase with SGC strength increasing.The transient and steady values of GWI with SGC are much larger than those without SGC.When Doppler broadening is present,the transient maximum value and steady value of GWI first increase and then decrease with Doppler broadening width(D) increasing,and the value of D which corresponds to the maximum transient GWI is different from that corresponding to the maximum steady GWI.The time needed for reaching the steady GWI increases with D increasing.The steady GWI,which is larger than that without Doppler broadening(D = 0),can be obtained by choosing appropriate D and SGC strength.

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