光电子快报(英文版), 2012, 8 (1): 72, Published Online: Jul. 12, 2017  

Influence of relative phase on propagation effect in open Vtype three-level system

Author Affiliations
College of Physics and Electronics, Shandong Normal University, Jinan 250014, China
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 (γ0) 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 γ0 (S), LWI gain and probe field intensity increase with γ0 (S) increasing. In the open system, LWI gain and probe field intensity much larger than those in the corresponding closed system can be obtained.

LIANG Ying, JIA Ke-ning, LIU Zhong-bo, FAN Xi-jun. Influence of relative phase on propagation effect in open Vtype three-level system[J]. 光电子快报(英文版), 2012, 8(1): 72.

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