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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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| Cite this article: |
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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.
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| Keywords:
42.50.Gy
42.50.Hz
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Received: 22 November 2006
Published: 24 February 2007
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| PACS: |
42.50.Gy
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(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
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42.50.Hz
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(Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift)
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