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Electromagnetically Induced Transparency in a Radio-Frequency Discharge

PAVONE, FRANCESCO SAVERIO, CATALIOTTI, FRANCESCO SAVERIO, INGUSCIO, MASSIMO, M. ARTONI, G. BIANCHINI, P. CANCIO

Published Jan 1, 1998• 0 citations
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Abstract

We report on electromagnetically induced transparency in a radio-frequency discharge of metastable helium atoms. We show that a large effect can be observed in spite of the discharge regime needed to produce the metastable helium and in spite of its Zeeman degeneracy. We discuss the mechanism and the conditions for the observation of such a phenomenon in a helium discharge.

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We report on electromagnetically induced transparency in a radio-frequency discharge of metastable helium atoms. We show that a large effect can be observed in spite of the discharge regime needed to produce the metastable helium and in spite of its Zeeman degeneracy. We discuss the mechanism and the conditions for the observation of such a phenomenon in a helium discharge.
Sum-frequency generation with electromagnetically induced transparency (EIT) has been examined in a hydrogen discharge. EIT is demonstrated in the $3p\ensuremath{-}1s$ and $4p\ensuremath{-}1s$ transitions at 102.6 and 97.3 nm, respectively, with increased efficiency of generation arising from higher H-atom density, although competing effects due to the presence of H2{\mathrm{H}}_{2}H2​ distort the line shapes of these spectra. Only for shorter-wavelength transitions (such as $7p\ensuremath{-}1s$ and $8p\ensuremath{-}1s)$ that show very large shifts and distortions is there a decrease in intensity in comparison with generated radiation from H atoms external to the discharge.
Electromagnetically induced transparency and absorption of a monochromatic light controlled by a radio frequency field in the cold multi-Zeeman-sublevel atoms are theoretically investigated. These Zeeman sublevels are coupled by a radio frequency (RF) field. Both electromagnetically induced transparency and electromagnetically induced absorption can be obtained by tuning the frequency of RF field for both the linear polarization and elliptical polarization monochromatic lights. When the transfer of coherence via spontaneous emission from the excited state to the ground state is considered, electromagnetically induced absorption can be changed into electromagnetically induced transparency with the change of intensity of radio field. The transparency windows controlled by the RF field can have potential applications in the magnetic-field measurement and quantum information processing.