One- and two-photon absorption-amplification response in a four-level atomic system with vacuum-induced coherence
Li Jia-Hua (李家华)a, Chen Ai-Xi (陈爱喜)ab, Liu Ji-Bing (刘继兵)a, Xie Xiao-Tao (谢小涛)a
a Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China; b Department of Applied Physics, School of Basic Science, East China Jiaotong University, Nanchang 330013, China
Abstract This paper theoretically studies the effects of the vacuum-induced coherence on one- and two-photon absorption in a four-level atomic medium. It finds that the one- and two-photon absorption and amplification properties are quite sensitive to the vacuum-induced coherence. It is also shown that the one- and two-photon absorption spectra can be dramatically affected by modulating the relative phase of the applied fields. With the proper choice of the relative phase, the amplification without inversion for the probe field can be realized.
Received: 27 September 2005
Revised: 10 November 2005
Accepted manuscript online:
PACS:
42.50.Gy
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
(Quantum optical phenomena in absorbing, amplifying, dispersive and conducting media; cooperative phenomena in quantum optical systems)
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10575040 and 90503010).
Cite this article:
Li Jia-Hua (李家华), Chen Ai-Xi (陈爱喜), Liu Ji-Bing (刘继兵), Xie Xiao-Tao (谢小涛) One- and two-photon absorption-amplification response in a four-level atomic system with vacuum-induced coherence 2006 Chinese Physics 15 721
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