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Proceedings Paper

Z-scan measurements in saturable nonlinear refraction media
Author(s): E. Tenorio; Tomaz Catunda
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Paper Abstract

The well-known Z-scan tecimique has been extensively applied to the study of large class of nonlinear materials. In some cases, particularly in optical limiters applications, it is important to study the nonlinearity in the high intensity regime where most material's nonlinear properties saturate with the light intensity. This saturation effect causes a change in the nonsaturated gaussian refractive index profile and consequently the usual Z-scan theory can not be used. We have studied this problem calculating the far-field pattern of the beam, transmitted by a nonlinear material, using the Kirchhoff-Fraunhofer diffraction integral. We also performed Zscan experiments in chromium doped saturable absorbers ruby, alexandrite and GdAlO3:Cr3. We believe that these materials are very suitable to this study because they present high saturable nonlinear refractive index, the experiments can be made with Ar laser in the cw regime and their properties are very well characterized in previous works'.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354911
Show Author Affiliations
E. Tenorio, Univ. de Sao Paulo (Brazil)
Tomaz Catunda, Univ. de Sao Paulo (Brazil)

Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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