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Carrier‐Induced Pulse Narrowing in Indium‐Doped CdS
Author(s) -
Hönig T.,
Gutowski J.,
Broser I.
Publication year - 1990
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221590142
Subject(s) - materials science , doping , dopant , optoelectronics , indium , excitation , polarization (electrochemistry) , free carrier , optical bistability , wavelength , ionization , laser , optics , chemistry , nonlinear optics , physics , ion , organic chemistry , quantum mechanics
Strong optical nonlinearities and bistability in the band‐gap region are known to occur in CdS doped with indium by 10 16 to 10 18 cm −3 , which are due to the neutralization of ionized acceptors. In time‐resolved single‐beam measurements an absorptive effect becomes dominant for excitation densities higher than 1 MW/cm 2 in addition to the known induced transmission. The combination of both processes yields a narrowing of the shape of the transmitted pulse. This phenomenon is studied in dependence of the laser wavelength, intensity, and polarization, as well as on the temperature and the dopant concentration. The experimental results can be understood in a model of interaction of free carriers with photonic polaritons.