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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 16 — Aug. 13, 2004
  • pp: 1873–1875

Flow imaging by use of femtosecond-laser-induced two-photon fluorescence

James B. Kelman, Douglas A. Greenhalgh, Euan Ramsay, Dong Xiao, and Derryck T. Reid  »View Author Affiliations


Optics Letters, Vol. 29, Issue 16, pp. 1873-1875 (2004)
http://dx.doi.org/10.1364/OL.29.001873


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Abstract

A novel technique is demonstrated for the imaging of turbulent flows in which a single window to the flow is the only optical access required. A femtosecond laser is used to excite two-photon fluorescence in a disodium-fluorescein-seeded water jet. The fluorescence signal is generated at only the focal point of the laser because of the highly nonlinear nature of the two-photon absorption, and it is collected in a direction counterpropagating to the excitation beam. Tight focusing of the laser is used to limit the probe volume, and the two-dimensional mean and rms concentration images are collected by raster scanning the laser.

© 2004 Optical Society of America

OCIS Codes
(110.2970) Imaging systems : Image detection systems
(140.7090) Lasers and laser optics : Ultrafast lasers
(280.2490) Remote sensing and sensors : Flow diagnostics
(300.2530) Spectroscopy : Fluorescence, laser-induced

Citation
James B. Kelman, Douglas A. Greenhalgh, Euan Ramsay, Dong Xiao, and Derryck T. Reid, "Flow imaging by use of femtosecond-laser-induced two-photon fluorescence," Opt. Lett. 29, 1873-1875 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-16-1873

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