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Type: Artigo de periódico
Title: Z-scan measurements of photorefractive nonlinearities for a SBN:Ce crystal
Author: Bian, S
Frejlich, J
Abstract: In this paper, we derived the Z-scan formula for a photorefractive crystal sample under an external applied electric field. The far-field diffraction pattern of a Gaussian beam wavefront through a photorefractive crystal is calculated by considering spatial-phase perturbation induced by the space-charge field. The photorefractive drift nonlinearities and correspondingly, the electro-optic coefficients r(33), r(13), (r(23)) and the characteristic ratio n(e)(3)r(33)/n(0)(3)r(13) for a cerium-doped Sr0.61Ba0.39Nb2O6 crystal are determined from the Z-scan experiments; Z-scan with enhanced sensitivity is also realized by measuring the normalized transmittance at the off-axis position in the far field. A deviation between the off-axis Z-scan experimental results and the theoretical prediction is discussed too.
Editor: Springer Verlag
Citation: Applied Physics B-lasers And Optics. Springer Verlag, v. 64, n. 5, n. 539, n. 546, 1997.
Rights: fechado
Identifier DOI: 10.1007/s003400050212
Date Issue: 1997
Appears in Collections:Unicamp - Artigos e Outros Documentos

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