| Liang Ying,Jia Ke-ning,Liu Zhong-bo,Fan Xi-jun.Influence of relative phase on propagation effect in open V-type three-level system[J].Optoelectronics Letters,2012,8(1):72-75 |
| Influence of relative phase on propagation effect in open V-type three-level system |
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| Abstract: |
| In this paper we study the influence of the relative phase between the probe and driving fields on propagation effect in an
open Doppler broadening V-type three-level atomic system with spontaneously generated coherence (SGC) by using the calculation
result of the density matrix motion equations and the propagation equations of the driving and probe fields. It is shown that
the relative phase (Φ) has remarkable periodical influence on the propagation effect, and the period is 2π. By selecting appropriate value of Φ, we can get larger lasing without inversion (LWI) gain and longer propagation distance in which gain exists, and hence obtain
higher probe field (i.e. LWI) intensity. When Φ=π/2, the largest LWI gain and probe field intensity can be got. In addition, the atomic exit rate (γ
0) and ratio (S) of the atomic injection rates also have a considerable modulation role on the phase-dependent propagation effect. In certain
value range of γ
0 (S), LWI gain and probe field intensity increase with γ
0 (S) increasing. In the open system, LWI gain and probe field intensity much larger than those in the corresponding closed system
can be obtained. |
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| This work has been supported by the National Natural Science Foundation of China ( No.10875072 |
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