Control of spontaneous emission spectra via an external coherent magnetic field in a cycle-configuration atomic medium
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We theoretically study the features of the spontaneous emission spectra in a coherently driven cold four-level atomic system with a cyclic configuration. It is shown that a few interesting phenomena such as spectral-line narrowing, spectral-line enhancement, and spectral-line suppression can be realized in our system. Interestingly enough, the spectral-line enhancement and suppression can be controlled just by appropriately modulating the phase, the frequency, and the intensity of an external coherent magnetic field, respectively. This investigation may find applications in high-precision spectroscopy.
PACS.42.50.Ct Quantum description of interaction of light and matter; related experiments 32.80.Qk Coherent control of atomic interactions with photons 32.50.+d Fluorescence, phosphorescence (including quenching)
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