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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 22, Iss. 9 — Sep. 1, 2005
  • pp: 1939–1948

Excited-state characterization and effective three-photon absorption model of two-photon-induced excited-state absorption in organic push–pull charge-transfer chromophores

Richard L. Sutherland, Mark C. Brant, Jim Heinrichs, Joy E. Rogers, Jonathan E. Slagle, Daniel G. McLean, and Paul A. Fleitz  »View Author Affiliations


JOSA B, Vol. 22, Issue 9, pp. 1939-1948 (2005)
http://dx.doi.org/10.1364/JOSAB.22.001939


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Abstract

We report experimental investigations of two-photon and excited-state absorption in D - π - A chromophores and propose a model to explain nonlinear absorption in the nanosecond regime. The key parameter is an effective three-photon absorption coefficient that depends on the two-photon absorption cross section and excited-state photophysical properties. We obtain all these parameters from independent measurements and then compare the model with nanosecond nonlinear transmission measurements. We find good agreement with the data, using no free parameters, for specific values of some published two-photon absorption cross sections. We conclude that excited singlet–singlet and triplet–triplet absorption are the dominant sources of nonlinear transmittance loss and that the chief role of two-photon absorption is to populate these states.

© 2005 Optical Society of America

OCIS Codes
(190.4180) Nonlinear optics : Multiphoton processes
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials

Citation
Richard L. Sutherland, Mark C. Brant, Jim Heinrichs, Joy E. Rogers, Jonathan E. Slagle, Daniel G. McLean, and Paul A. Fleitz, "Excited-state characterization and effective three-photon absorption model of two-photon-induced excited-state absorption in organic push-pull charge-transfer chromophores," J. Opt. Soc. Am. B 22, 1939-1948 (2005)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-22-9-1939

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