Abstract
In a V-type three-level atomic system with two near-degenerate excited levels, due to interaction with the vacuum of the radiation field, there exists a kind of quantum interference between two spontaneous decay channels, spontaneously generated coherence. In this paper, we investigate the effects of this kind of coherence on the transient process in the presence of a weak probe and a strong coherent field. We find that the properties of the transient process can be dramatically affected by the spontaneously generated coherence. The transient gain can be greatly enhanced due to the quantum interference from spontaneous emission, and the transient absorption can be almost eliminated just by choosing the proper relative phase between the two fields.
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