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Unexpected population inversions on both optical transitions via the effect of spontaneous emission-induced coherence of a ladder system

Hongmei Ma, Shangqing Gong, Chengpu Liu, Zhenrong Sun, Zhizhan Xu

Published Jul 8, 2004• 0 citations
Publisher

Abstract

We study the effect of spontaneous emission-induced coherence on population inversion in a ladder-type three-level system. We show that this kind of coherence can lead to unexpected population inversions on both of the optical transitions.
DOI
10.1109/cleopr.2003.1274691

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This paper investigates the effects of spontaneously induced coherence on absorption properties in a nearly equispaced three-level ladder-type system driven by two coherent fields. It find that the absorption properties of this system with the probe field applied on the lower transition can be significantly modified if this coherence is optimized. In the case of small spontaneous decay rate in the upper excited state, it finds that such coherence does not destroy the electromagnetically induced transparency (EIT). Nevertheless, the absorption peak on both sides of zero detuning and the linewidth of absorption line become larger and narrower than those in the case corresponding to the effects of spontaneously induced coherence; while in the case of large decay rate, it finds that, instead of EIT with low resonant absorption, a sharp absorption peak at resonance appears. That is, electromagnetically induced absorption in the nearly equispaced ladder-type system can occur due to such coherent effects.