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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 4 — Feb. 1, 2004
  • pp: 894–913

Excitation nonlinearities in emission reabsorption laser-induced fluorescence techniques

Carlos H. Hidrovo, Ricardo R. Brau, and Douglas P. Hart  »View Author Affiliations


Applied Optics, Vol. 43, Issue 4, pp. 894-913 (2004)
http://dx.doi.org/10.1364/AO.43.000894


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Abstract

The effects of the nonlinear behavior of fluorescent intensity with excitation intensity on emission reabsorption laser-induced fluorescence (ERLIF) are investigated. Excitation nonlinearities arise mainly as a consequence of the depletion of the ground-state population stemming from the finite lifetime of molecules in the excited state. These nonlinearities hinder proper suppression of the excitation intensity information in the fluorescence ratio, degrading measurement accuracy. A method for minimizing this effect is presented. This method is based on the approximation of the fluorescence intensity nonlinearities by a power law. Elevating the two-dimensional fluorescent intensity maps to the appropriate exponent allows for proper suppression of excitation intensity in the fluorescence ratio. An overview of the principles and constitutive equations behind ERLIF film-thickness measurements, along with a characterization of the fluorescence’s nonlinear behavior, is presented. The power law approximation and processing scheme used to mitigate this behavior are introduced. Experimental proof of the validity of the approximation and processing scheme is provided.

© 2004 Optical Society of America

OCIS Codes
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3940) Instrumentation, measurement, and metrology : Metrology
(190.0190) Nonlinear optics : Nonlinear optics
(260.2510) Physical optics : Fluorescence
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced

History
Original Manuscript: July 16, 2003
Revised Manuscript: July 16, 2003
Published: February 1, 2004

Citation
Carlos H. Hidrovo, Ricardo R. Brau, and Douglas P. Hart, "Excitation nonlinearities in emission reabsorption laser-induced fluorescence techniques," Appl. Opt. 43, 894-913 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-4-894

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