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The production of light at the combination frequency 2ω₁-ω₂ by two incident-tunable coherent beams at the frequencies ω₁ and ω₂, respectively, has been studied in CuCl, as 2ω₁ is varied across the Z₃-exciton-polariton dispersion curve, and/or ω₁-ω₂ is varied across the longitudinal phonon-polariton dispersion curve. The interference of the excitonic and Raman resonances with the nonresonant electronic nonlinear susceptibility gives new information about the nonlinear properties of the Z₃ exciton and its damping as a function of temperature. A detailed theoretical and experimental comparison with earlier work on two-photon absorption and second-harmonic generation in CuCl is presented.
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Krämer et al. (1976) studied this question.
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