PICOSECOND INTERBAND SATURATION AND INTRABAND RELAXATION OF PHOTOEXCITED CARRIERS IN GERMANIUM
Résumé
We report new structure in the picosecond interband saturation of germanium. The excite-probe technique has been employed in an extensive study of a 6 - µm-thick slice of crystalline germanium as a function of temperature, excite pulse energy, and time delay between the excite and probe pulses from a Nd-glass laser. The results can be interpreted successfully in terms of a dynamic band-filling by a hot carrier distribution with intervalence-band absorption contributing at the highest carrier densities (~1020 cm-3). An intensity-dependent rise in sample transmission is observed that can exceed 200 psec under certain conditions and that is consistent with either a slow cooling of the hot carriers or with diffusion.
Domaines
Articles anciens
Origine : Accord explicite pour ce dépôt
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