Optical nonlinearities of PbSe are studied in picosecond pump-probe experiments at wavelengths from 4 to 8 μm. Excitation of an electron-hole plasma leads to a shift of the absorption edge to higher energies and to large changes of the refractive index by up to −0.1 for a carrier density of 4×1017 cm−3. The optical nonlinearities result from band filling by both electrons and holes. The time-dependent absorption change shows a partial recovery within 100 ps, giving evidence of enhanced recombination rates. Theoretical calculations of the absorption change are in agreement with the experimental data.
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Klann et al. (1991) studied this question.
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