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Article
Thermal-Lens Model Compared With the Sheik-Bahae Formalism in Interpreting Z-Scan Experiments on Lyotropic Liquid Crystals
Chemical Physics Publications (2002)
  • Fabio Luiz Sant'Anna Cuppo
  • Antonio Martins Figueiredo Neto
  • Sergio Leonardo Gomez
  • Peter Palffy-Muhoray, Kent State University - Kent Campus
Abstract

We carried out Z-scan measurements on lyotropic liquid crystals and on lyotropic liquid crystals doped with ferrofluid. In these experiments, the sample is translated through the focal region of a focused Gaussian laser beam. The dependence of the far-field intensity on sample position due to intensity-dependent optical nonlinearities has been analyzed on the basis of the thermal-lens model of Gordon et al. and the Gaussian decomposition analysis of Sheik-Bahae et al. The thermal-lens model is nonlocal in space and time, whereas the Gaussian decomposition is predicated on a strictly local response. We compare the goodness of fit of the predictions of these models to experimental data, and we discuss limitations of these models in describing Z-scan experiments on systems with nonlocal response.

Keywords
  • Single-Beam,
  • Optical Nonlinearities,
  • Refraction,
  • Nematics
Disciplines
Publication Date
June, 2002
Publisher Statement
This paper was published in the Journal of the Optical Society of America B and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/JOSAB.19.001342 Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Citation Information
Fabio Luiz Sant'Anna Cuppo, Antonio Martins Figueiredo Neto, Sergio Leonardo Gomez and Peter Palffy-Muhoray. "Thermal-Lens Model Compared With the Sheik-Bahae Formalism in Interpreting Z-Scan Experiments on Lyotropic Liquid Crystals" Chemical Physics Publications Vol. 19 Iss. 6 (2002)
Available at: http://works.bepress.com/peter_palffy-muhoray/18/