Effects of relative phase on transient evolution in an open resonant ladder-type atomic system
Yang Yan-Ling(杨艳玲)a), Liu Zhong-Bo(刘中波)a), Wang Lei(王蕾)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 and Microelectronics, Shandong University, Jinan 250100, China
Abstract In an open ladder-type resonant atomic system, variation in relative phase between probe and driving fields does not affect the transient evolution of populations, but it has remarkable effects on gain and dispersion of the probe field. No matter whether an incoherent pump is present or absent, transient and stationary gains without inversion (GWI) always can be obtained by choosing an appropriate value of the relative phase. When the incoherent pump is absent，the values of transient and stationary GWIs are much larger and the time interval required to reach the stationary value is longer than those when the incoherent pump is present. Varying the exit rate and the ratio between injection rates can obviously change the phase-dependent GWI. In addition, in the transient evolution process, the phenomenon of high dispersion (refractive index) without absorption occurs at some values of relative phase. In the corresponding closed system, the stationary GWI can be obtained by choosing an appropriate value of relative phase only when incoherent pump exists, moreover the gain is smaller than that in the open system.
Received: 25 August 2008
Revised: 24 September 2008
Accepted manuscript online:
Fund: Project supported by the Natural
Science Foundation of Shandong Province, China (Grant No Y2006A21)
and the National Natural Science
Foundation of China (Grant No 10675076).
Cite this article:
Yang Yan-Ling(杨艳玲), Liu Zhong-Bo(刘中波), Wang Lei(王蕾), Tong Dian-Min(仝殿民), and Fan Xi-Jun(樊锡君) Effects of relative phase on transient evolution in an open resonant ladder-type atomic system 2009 Chin. Phys. B 18 1054
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