Flow imaging using femtosecond-laser-induced two-photon fluorescence
Date
2004-08
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Journal Title
Journal ISSN
Volume Title
Publisher
Optical Society of America
Department
Type
Postprint
ISSN
0146-9592
Format
Citation
James B. Kelman, Douglas A. Greenhalgh, Euan Ramsay, Dong Xiao, Derryck T. Reid, Flow imaging by use of femtosecond-laser-induced two-photon fluorescence, Optics Letters, Volume 29, Issue 16, 1873-1875, August 2004
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 only at the focal point of the laser due to the highly nonlinear nature of the two-photon absorption and 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.