The theory of the excitation and amplification of longitudinal-optical lattice vibrations in a degenerate semiconductor in the presence of an electromagnetic wave is presented. It is shown that in the intense-field limit only multiphoton absorption processes are significant and as a result the optical-phonon population grows with time. A numerical estimate of the actual growth rate is given for a typical semiconductor like GaAs.
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Tronconi et al. (1986) studied this question.
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