Abstract
Third harmonic generation has been investigated theoretically in the vicinity of a two-photon resonance. Optimum achievable conversion efficiencies are given for a fixed column density as well as for an optimized column density for input intensities ranging from 10 6–10 10 W/cm 2. It is shown that the resonant enhancement in the small signal limit is turned into a minimum of the conversion efficiency at high input intensities. Under optimum conditions the minimum is partially filled up. This is due to the varying AC-Stark shift of the two-photon resonant transition over the length of the nonlinear medium.
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