Trichromatic phase manipulation of the response of a two-level medium to an arbitrarily intense probe field |
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Authors: | Guo Hong-Ju Hu Xiang-Ming Li Jing-Yan Li Xiao-Xi Shi Wen-Xing and Xu Qing |
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Institution: | Department of Physics, Huazhong Normal University, Wuhan 430079,China |
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Abstract: | The phase dependence and independence of the response of a trichromatically
driven two-level medium to an arbitrarily intense probe field have been
studied.
The sum of the relative phases of the sideband components of the
trichromatic field compared to the central component plays a crucial role in
the response of the medium. For a weak probe field, as the sum of the
relative phases changes from $0$ to $\pi $, multiple switching can be
achieved, in which switching from normal to anomalous dispersion occurs in
multiple separate frequency regimes. The remarkable dependence on the sum
phase is also shown for a strong probe field. On the other hand, when the
sum of the two relative phases is fixed, the changes in the respective phases
have no influence on the response of the medium. |
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Keywords: | absorption and dispersion phase dependence and independence multiple switching from normal to anomalous dispersion |
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