Abstract This paper studies the narrow spectral feature appearing in a four-level system coupled by two strong coherent fields and probed by a weak laser field. The linewidth is examined as a function of the Rabi frequencies of coupling fields, and the result is explained by using the dressed-state formalism.
Received: 19 September 2007
Revised: 13 February 2008
Accepted manuscript online:
Fund: Project supported by the Natural
Science Foundation from Hebei Province, China (Grant No
A2005000091).
Cite this article:
Yang Li-Jun(杨丽君), Zhang Lian-Shui(张连水), Zhuang Zhong-Hong(庄仲红), Guo Qing-Lin(郭庆林), and Fu Guang-Sheng(傅广生) Spectral feature with sub-natural linewidth due to quantum interference in a four-level system 2008 Chin. Phys. B 17 2147
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