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A two-step optical resonance experiment, which realizes the optical analogue of the Autler-Townes experiment, has been performed on a sodium atomic beam excited by two CW narrow-band dye lasers. An intense laser radiation was locked to a component of the D 2 resonance line while a weak laser radiation probed an upper connected transition. A dynamic Stark splitting of the probe transition was clearly observed for various intensities of the strong resonant radiation.
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Picqué et al. (1976) studied this question.
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