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Proceedings Paper

Characterization of thermo-optic nonlinearities in glass filters using the Z-scan technique
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Paper Abstract

For nonlinear optical materials in which the excitation diffuses significantly during the time scale of measurement the usual analysis of a Z-scan experiment must be modified. We develop a simple first order theory based on a quadratic rather than Gaussian spatial modulation of the index of refraction. This leads to asymmetric Z-scan curves. We apply this theory to the study of the thermal-optic effect in a simple neutral density filter. A significant spatial phase chirp can be induced in these filters at modest intensities. The observed transmission curves agree well with the quadratic theory.

Paper Details

Date Published: 24 July 2002
PDF: 9 pages
Proc. SPIE 4751, ICONO 2001: Nonlinear Optical Phenomena and Nonlinear Dynamics of Optical Systems, (24 July 2002); doi: 10.1117/12.475922
Show Author Affiliations
Alexander N. Korolevich, National Academy of Sciences of Belarus and Univ. do Minho (Belarus)
Michael Scott Belsley, Univ. do Minho (Portugal)

Published in SPIE Proceedings Vol. 4751:
ICONO 2001: Nonlinear Optical Phenomena and Nonlinear Dynamics of Optical Systems
Konstantin N. Drabovich; Nikolai S. Kazak; Vladimir A. Makarov; Alexander P. Voitovich, Editor(s)

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