Abstract
A folded three-level system that is excited to resonance fluorescence with two monochromatic lasers exhibits a dark resonance. This phenomenon is usually interpreted as arising from a coherent superposition of two long-lived states1–3. To demonstrate directly such an atomic coherence, we propose intensity correlation measurements of the resonance fluorescence with a phase shift between the laser phases introduced after a certain delay time.
© 1991 Optical Society of America
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