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Phys. Rev. A 66, 063812 (2002) [6 pages]

Effects of spontaneously generated coherence on transient process in a Λ system

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Wei-Hua Xu1,2, Jin-Hui Wu1,2, and Jin-Yue Gao1,2,3

1College of Physics, Jilin University, Changchun 130023, People’s Republic of China
2Key Laboratory of Coherent Light, Atomic and Molecular Spectroscopy, Educational Ministry of China, People’s Republic of China
3CCAST (World Laboratory), P.O. Box 8370, Beijing 100080, People’s Republic of China

Received 5 September 2002; published 26 December 2002

Due to interaction with the vacuum of the radiation field, near-degenerate lower levels in a Λ system have an additional coherence term, the spontaneously generated coherence term. 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, with or without an incoherent pump. We find that the transient gain (absorption) properties can be dramatically affected by the spontaneously generated coherence. The transient gain can be greatly enhanced due to the effect of spontaneously generated coherence, and the transient absorption can be completely eliminated just by choosing the proper relative phase between the two fields.


©2002 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevA.66.063812
DOI: 10.1103/PhysRevA.66.063812
PACS: 42.50.Gy, 42.50.Hz

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