The dispersive properties of an excited-doubletfour-level atomic system |
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Authors: | Hu Zheng-Feng Deng Jian-Liao and Wang Yu-Zhu |
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Institution: | The Key Laboratory of Quantum Optics, Shanghai Institute of
Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai
201800, China |
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Abstract: | We have investigated the dispersive properties of excited-doublet
four-level atoms interacting with a weak probe field and an intense
coupling laser field. We have derived an analytical expression of
the dispersion relation for a general excited-doublet four-level
atomic system subject to a one-photon detuning. The numerical
results demonstrate that for a typical rubidium $\rm {D1}$ line
configuration, due to the unequal dipole moments for the transitions
of each ground state to double excited states, generally there
exists no exact dark state in the system. Close to the two-photon
resonance, the probe light can be absorbed or gained and propagate
in the so-called superluminal form. This system may be used as an
optical switch. |
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Keywords: | photon-atom interaction susceptibility quantum interference phenomena |
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