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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 17, Iss. 11 — Nov. 1, 2000
  • pp: 1867–1873

Improved fitting equation for frequency-resolved femtosecond hyper-Rayleigh scattering experiments

Geert Olbrechts, Koen Clays, and André Persoons  »View Author Affiliations


JOSA B, Vol. 17, Issue 11, pp. 1867-1873 (2000)
http://dx.doi.org/10.1364/JOSAB.17.001867


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Abstract

One approach to the experimental determination of the molecular second-order nonlinear polarizability, or the first hyperpolarizability, of fluorescent species by hyper-Rayleigh scattering is based on high-frequency demodulation of the time-delayed fluorescence contribution to the immediate scattering signal [Rev. Sci. Instrum. 69, 2233 (1998)]. For typical fluorescence lifetimes of less than a nanosecond a detection bandwidth of more than 1 GHz is necessary. This bandwidth has not yet been realized. Measurements at successively higher modulation frequencies are performed instead. A fitting of the apparent hyperpolarizability as a function of the modulation frequency then reveals the inherent hyperpolarizability without the fluorescence contribution. An improved fitting function has been derived, resulting in the elimination of a small systematic error and in the reduction of the larger statistical uncertainty in the deduced value. Possible implications of the improved accuracy and precision are discussed.

© 2000 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(160.4890) Materials : Organic materials
(190.0190) Nonlinear optics : Nonlinear optics
(190.4180) Nonlinear optics : Multiphoton processes
(190.4400) Nonlinear optics : Nonlinear optics, materials

Citation
Geert Olbrechts, Koen Clays, and André Persoons, "Improved fitting equation for frequency-resolved femtosecond hyper-Rayleigh scattering experiments," J. Opt. Soc. Am. B 17, 1867-1873 (2000)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-17-11-1867


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References

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