Abstract
Picosecond recombination processes of photoexcited electron-hole plasma in lead chalcogenides are directly monitored via time-resolved pump-probe experiments at wavelengths from 3 to 10 mu m. Bleaching of the interband absorption due to band filling gives rise to a large change in the refractive index. The time-resolved change of absorption of PbSe at T=70 K reveals a rapid recombination within 100 ps for excitation densities above 7*1017 cm-3. Comparative measurements of mid-infrared luminescence spectra demonstrate that this behaviour is due to recombination by stimulated emission. At T=300 K, Auger recombination on a time scale of 2 ns is observed below the threshold of stimulated emission. The analysis of the time-resolved data gives an Auger coefficient of 1.1+or-0.3*10-28 cm6 s-1 for a carrier density of 3*1018 cm-3.
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