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Type: Artigo de periódico
Title: Light induced permanent modifications of the nonlinear optical properties of semiconductor doped glasses
Author: Duarte, AS
Fragnito, HL
Palange, E
Abstract: The nonlinear refractive index, n(2), and the two photon absorption coefficient, beta, of semiconductor doped glasses were experimentally investigated in the region of two photon absorption. We demonstrated that the magnitude and sign of the measured n(2) strongly depend on the previous exposure of the sample to the laser radiation. For fresh (not exposed) samples the nonlinearity is negative and large. After repeated measurements in the same spot, the magnitude of n(2) decreases, eventually becomes positive, and saturates to a value that approximates the value expected from bulk semiconductor theory. Copyright (C) 1996 Elsevier Science Ltd.
Subject: nanostructures
optical properties
recombination and trapping
nonlinear optics
Country: Inglaterra
Editor: Pergamon-elsevier Science Ltd
Rights: fechado
Identifier DOI: 10.1016/0038-1098(96)00455-3
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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