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Observation of narrow fluorescence from doubly driven four-level atoms at room temperature

Unusually narrow spectral features are seen in fluorescence peaks from 85Rb atoms under the action of two driving laser fields that are in a three-dimensional molasses configuration. One of the lasers, L1, is held at a fixed detuning from the “cooling” transition, while the other, L2, is scanned across the “repumping” transitions. The fluorescence peaks are split into symmetric pairs, with the separation within a pair increasing with the detuning of the L1 laser. For large detunings, additional small peaks are seen. A simple model is proposed to explain these experimental observations.