We report on an ac-Stark-effect-enhanced wave-mixing experiment in I₂ vapor in which an output uv signal at frequency 2ω₁+ω₂ is maximized when the input frequencies ω₁ and ω₂ are both detuned in the same direction from the resonance frequencies of the free molecule. A theory based on a configuration interaction between the ``dressed molecular levels'' is presented to explain the strong enhancement of the uv signal under these conditions. The data presented demonstrate that tunable coherent radiation at ultraviolet and vacuum-ultraviolet frequencies can be generated by the wave-mixing process we describe.
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Tai et al. (1988) studied this question.
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