Abstract
A near-resonant rf field pumping the hyperfine transition between the two ground states of a $\mathrm{\ensuremath{\Lambda}}$-shaped dark resonance leads to a resonance tripling, each component displaying electromagnetically induced transparency (EIT). We investigate the three resonances under high spectral and temporal resolution. The triplet formation is analogous to that of the Mollow triplet but distinct in that the role played by the spontaneous emission rate is now taken by the one-photon scattering rate of the optical Raman transition. Complex phase relations exist between the three em fields under EIT conditions. We explain our observations using numerical solutions of the quantum master equation as well as a simple analytical dressed-state model.
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