A nonperturbative theory is presented for the gas polarization induced by two lasers. The first laser ionizes Li(2s) by three-photon absorption, with the first two photons in resonance with the 3d level. A second laser stimulates recombination into the 3s level, thereby inducing an autoionizing-like structure in the continuum. It is found that the polarization (and hence possibly third-harmonic generation) is enhanced near the induced resonance.
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Burke Ritchie (1985) studied this question.
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