Third-harmonic generation in an AlGaAs/AlAs superlattice is observed for the first time at a pump-light wavelength of around 2 μm. The value of third-order optical susceptibility χ(3), for the polarization parallel to the superlattice layer in a nonresonant region, is close to that reported for bulk GaAs. Enhancement of χ(3), giving more than three times the nonresonant value, is observed near a three-photon resonance region. A characteristic third-harmonic signal is observed when the pump-light polarization has a component perpendicular to the superlattice layer. This is considered to be another χ(3) enhancement which is caused by nonparabolicity in the superlattice.
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Kobayashi et al. (1989) studied this question.
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