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Proceedings Paper

High-frequency demodulation of multiphoton fluorescence in hyper-Raleigh scattering
Author(s): Geert Olbrechts; Tom Munters; Koen J. Clays; Andre P. Persoons
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Paper Abstract

Femtosecond hyper-Rayleigh scattering (HRS) is used for the suppression of multi-photon fluorescence contributions to the apparent HRS signal. The intrinsic high harmonic content of the femtosecond pulse is used as a high frequency amplitude modulation source. Due to the nonzero fluorescence lifetime, a high amplitude modulation frequency will result in an amplitude demodulated and phase shifted fluorescence signal. At very high modulation frequencies, the fluorescence signal becomes completely demodulated and only the inherent HRS signal will remain. Experimental verification has been obtained by the fluorescence suppression for a well known centrosymmetric fluorophore, 9,10-diphenylanthracene, added to a solution of a well characterized nonlinear optical chromophore, crystal violet. A comparison has also been made between the first hyperpolarizability value (beta) of a nonfluorescent ionic hemicyanine dye and the (beta) value of the fluorescent inclusion complex of the dye incorporated in an amylose matrix. The inherent fluorescence-free (beta) value for the complex appeared to be twice the value for the dye itself.

Paper Details

Date Published: 29 October 1998
PDF: 12 pages
Proc. SPIE 3474, Second-Order Organic Nonlinear Optics, (29 October 1998); doi: 10.1117/12.328566
Show Author Affiliations
Geert Olbrechts, Katholieke Univ. Leuven (Belgium)
Tom Munters, Katholieke Univ. Leuven (Belgium)
Koen J. Clays, Katholieke Univ. Leuven (Belgium)
Andre P. Persoons, Katholieke Univ. Leuven and Optical Sciences Ctr./Univ. of Arizona (Belgium)

Published in SPIE Proceedings Vol. 3474:
Second-Order Organic Nonlinear Optics
Manfred Eich, Editor(s)

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