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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: 863–870

Alternation and saturation effects in the chain-length dependences of the third-order hyperpolarizabilities of cyanines

W. Werncke, M. Pfeiffer, A. Lau, W. Grahn, H.-H. Johannes, and L. Dähne  »View Author Affiliations


JOSA B, Vol. 15, Issue 2, pp. 863-870 (1998)
http://dx.doi.org/10.1364/JOSAB.15.000863


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Abstract

The chain-length dependences of static third-order hyperpolarizabilities γSTAT of the homologous series of thiacyanines, of their meso-nitrogen-substituted derivatives, and of simple bis(dimethylamino)methine dyes are determined from nondegenerate four-wave mixing dispersion curves. We determined nearly the same very rapid increase of γSTAT with growing numbers of π electrons of the chain (γSTAT-N8±2) for both the thiacyanine and the bis(dimethylamino)methine series, an alternating influence of meso-nitrogen substitution for even and for odd double bonds of the chain, and a saturation of the hyperpolarizability for the longest thiacyanine (thiatricarbocyanine). We discuss our results, taking into account semiempirical quantum chemical calculations.

© 1998 Optical Society of America

OCIS Codes
(120.6710) Instrumentation, measurement, and metrology : Susceptibility
(190.0190) Nonlinear optics : Nonlinear optics
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

Citation
W. Werncke, M. Pfeiffer, A. Lau, W. Grahn, H.-H. Johannes, and L. Dähne, "Alternation and saturation effects in the chain-length dependences of the third-order hyperpolarizabilities of cyanines," J. Opt. Soc. Am. B 15, 863-870 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-2-863

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