The transient absorption from the heavy-hole band to the light-hole band of p-type germanium is investigated at a wavelength of 10 {μ}m. A nonequilibrium carrier distribution is generated by an intense pump pulse and the resulting change of absorption is monitored. A strong bleaching followed by an absorption increase is observed which depends upon the excitation intensity and the initial carrier temperature. The inter-valence-band scattering of the excited holes via optical phonons occurs on a subpicosecond time scale, whereas the subsequent cooling continues for tens of picoseconds.
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Woerner et al. (1990) studied this question.
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