Stimulated electronic hyper-Raman scattering has been obtained in lithium vapor via excitation of several two-photon resonances (2s-3d, 2s-4s, 2s-4d) with a pulsed dye laser. The wavelength of the generated radiation was shorter than the pump wavelength and tunable over a few nanometers. The tuning behavior of the hyper-Raman laser was influenced by two-photon induced self-focusing/self-defocusing effects.
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Krökel et al. (1986) studied this question.
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