Abstract

The temporal evolution of a high-density (N > 1020 cm−3) plasma is studied in CuCl with subpicosecond accuracy, using pump and probe transmission techniques and time-resolved luminescence detection. The optical creation of the carriers leads to an instantaneous band-gap reduction and a delayed exciton bleaching. This last feature is discussed in terms of a thermal relaxation of the plasma. Pump-induced absorption and gain spectra are compared with a calculation that takes into account the screening of the carrier–longitudinal-optical phonon interaction at high densities. The same model is applied to a luminescence line-shape analysis. From the agreement between theory and experiment it is possible to determine the characteristics of the plasma at different stages of its evolution.

© 1985 Optical Society of America

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