Sensitive spectroscopy of coherent atomic media
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abstract
A new regime of spectroscopy involving the probing of electromagnetically induced transparency resonances associated with two-photon transitions in dense atomic vapors of three-level atoms driven by strong optical fields is presented. The width of the transmission resonance trans displays a substantial density-dependent narrowing that is only limited by the residual absorption resulting from a coherence decay of the two-photon transition. The dispersive resonances are observed because of the presence of an extra field, which is parametrically generated by a resonantly enhanced three-wave mixing process.