Abstract

We discuss the possibility of producing harmonics while the process of collective spontaneous emission (superradiance) takes place in a solid. Self correlations of dipole radiators induced by the emitted field lead to a reduction of the emission time and consequently to an increase of the intensity. Estimations of the superradiant energy flux show that, for crystalline densities of radiators, this flux may be comparable with the atomic unit. This assures the highly nonlinear behavior necessary to observe a pulse of high harmonics during superradiant pulse. We apply the Floquet–Bloch expansion to analyze the features of harmonic production in the framework of the two-level model.

© 1997 Optical Society of America

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