Effect of exit and injection rates on phase-dependent transient evolution of gain without inversion
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Abstract:
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. Supported by the National Natural Science Foundation of China (Grant No. 10675076)and the Natural Science Foundation of Shandong Province (Grant No. Y2006A21).
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TN241
