Electronic Resource
[S.l.]
:
American Institute of Physics (AIP)
Journal of Applied Physics
77 (1995), S. 277-286
ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Third-order optical nonlinearities and recombination processes of photoexcited electron-hole plasma in PbSe and PbTe are directly monitored by picosecond pump-probe experiments in the wavelength range from 3 to 10 μm. After excitation, a strong blue shift of the absorption edge and large changes of the refractive index are found. Time-resolved studies of the absorption changes at lattice temperatures between 70 and 160 K reveal a fast partial decrease of the carrier density within 100 ps at excitation densities exceeding 7×1017 cm−3. Comparative emission spectra demonstrate that this behavior is due to recombination by stimulated emission. At room temperature the nonradiative Auger recombination dominates on a 0.5–2 ns time scale below the threshold of stimulated emission. The overall Auger coefficients for carrier densities of about 1018 cm−3 are derived from the data and have values of cAPbSe=1.1±0.3×10−28 cm6/s and cAPbTe=2.5±1.3×10−28 cm6/s. © 1995 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.359388
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