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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 2 — Feb. 1, 1998
  • pp: 810–816

Numerical analysis of Z-scan experiments by use of a mode expansion

Anders Eriksson, Mikael Lindgren, Sören Svensson, and Per-Otto Arntzen  »View Author Affiliations


JOSA B, Vol. 15, Issue 2, pp. 810-816 (1998)
http://dx.doi.org/10.1364/JOSAB.15.000810


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Abstract

The Z-scan analysis technique has been developed to permit characterization of nonlinear refractive indices and nonlinear absorption of non-Gaussian laser beams by a numerical approach. The new approach is based on a mode expansion of the electric field of the laser beam into Gaussian–Laguerre or Gaussian–Hermite modes. The individual modes are propagated within the nonlinear sample under the influence of the intensity-dependent phase shifts. The resulting electric field at the exit plane is expanded as a new sum of Gaussian–Laguerre or Gaussian–Hermite modes. From the final mode expansion the field distribution at the detector plane is calculated. The method also makes it possible to simulate a variety of complex optical limiting devices, such as stacks of samples with different material parameters and thick samples with a variation of material parameters along the z axis. A series of test simulations is presented and compared with experimental Z-scan data of solutions of substituted phthalocyanine molecules.

© 1998 Optical Society of America

OCIS Codes
(030.4070) Coherence and statistical optics : Modes
(030.6600) Coherence and statistical optics : Statistical optics

Citation
Anders Eriksson, Mikael Lindgren, Sören Svensson, and Per-Otto Arntzen, "Numerical analysis of Z-scan experiments by use of a mode expansion," J. Opt. Soc. Am. B 15, 810-816 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-2-810


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