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Short-pulse light excitation of LiNbO3 : Hopping versus coherent band transport analysis

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Abstract

The dynamics of electronic carriers after a light excitation pulse in Fe-doped LiNbO3 crystals is discussed under two alternative theoretical schemes. One considers thermally-activated diffusive transport of electrons (hopping) and uses a MonteCarlo approach. Simulations of the temporal evolution of the small polarons (Nb+4/Nb+5) and iron-impurity (Fe+2/Fe+3) centers during and after the light pulse has been obtained for different light intensities and antisite concentrations. On the other hand, the kinetics has been also described by using a standard two-center model and coherent band transport. The results of the two approaches have been compared on the light of the available experimental data.

© 2005 Optical Society of America

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