Chin. Phys. Lett.  2007, Vol. 24 Issue (2): 428-431    DOI:
Original Articles |
Six-Fold Degenerate Dark States in a Four-Level Atomic System
WU Jin-Hui;CUI Cui-Li;BA Nuo;MA Qi-Rong;GUO Xiu-Zhen
College of Physics, Jilin University, Changchun 130023
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WU Jin-Hui, CUI Cui-Li, BA Nuo et al  2007 Chin. Phys. Lett. 24 428-431
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Abstract With all driving fields on Raman resonance, a tripod-type atomic system quickly evolves into a dark state decoupled from the lossy excited level. The dark state depends strongly on field Rabi frequencies, spontaneous decay rates, and the initial atomic population in a complicated way. Analytical results reveal that it is a sixfold degenerate dark state with its three components superposed both coherently and incoherently due to population redistribution from spontaneous emission.
Keywords: 42.50.Gy      42.50.Hz     
Received: 22 November 2006      Published: 24 February 2007
PACS:  42.50.Gy (Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)  
  42.50.Hz (Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2007/V24/I2/0428
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WU Jin-Hui
CUI Cui-Li
BA Nuo
MA Qi-Rong
GUO Xiu-Zhen
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