Effect of exit and injection rates on phase-dependent transient evolution of gain without inversion

It is shown that in an open Λ-type system with spontaneously generated coherence, the transient evolution rule of the gain of lasing without inversion (LWI) is very sensitive to variation of the relative phase ϕ between the probe and driving fields; the variety of the atomic exit rate γ0 and the rat...

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Bibliographic Details
Published in:Optoelectronics letters 2007-09, Vol.3 (5), p.391-393
Main Authors: Qiao, Hong-xia, Bu, Fan-ge, Tan, Xia, Tong, Dian-min, Fan, Xi-jun
Format: Article
Language:English
Subjects:
Evolution
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Summary:It is shown that in an open Λ-type system with spontaneously generated coherence, the transient evolution rule of the gain of lasing without inversion (LWI) is very sensitive to variation of the relative phase ϕ between the probe and driving fields; the variety of the atomic exit rate γ0 and the ratio C of the atomic injection rates also have a considerable effect on the phase-dependent transient evolution rule of LWI gain. We find that when ϕ =0, the transient and stationary LWI gain increases with C increasing but decreases with γ0 increasing; when ϕ ≠ 0, the effect of C and γ0 on LWI gain is just opposite to that when ϕ=0; in order to get the largest transient and stationary LWI gain, we need selecting suitable values of ϕ, γ0 and C.
ISSN:1673-1905
1993-5013
DOI:10.1007/s11801-007-7046-7