Effects of relative phase on transient evolution in an open resonant ladder-type atomic system |
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Authors: | Yang Yan-Ling Liu Zhong-Bo Wang Lei Tong Dian-Min and Fan Xi-Jun |
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Institution: | College of Physics and Electronics, Shandong
Normal
University, Jinan 250014, China; School of Physics and Microelectronics, Shandong
University, Jinan 250100, China |
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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. |
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Keywords: | open system relative phase transient evolution gain without inversion |
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