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The saturation of resonant third-harmonic generation in absorbing and phase-matched high-density systems is investigated theoretically as well as experimentally. It is shown that the saturation is determined by the two-photon b pti [~p att fag( )l. Itgi ' u dcyl ti fth fl d Ul dl~lo h I f the level populations and of the effective refractive index destroying the phase matching. This has to be compared with nonresonant systems which are»recited by the Kerr effect, the intensityMependent changes of the refractive index [real part ofps" (co)].Optimum conditions for resonant systems are reported.

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