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

James B. Kelman, Douglas A. Greenhalgh, Euan Ramsay, Dong Xiao, Derryck T. Reid

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)1873-1875
Number of pages3
JournalOptics Letters
Issue number16
Publication statusPublished - 15 Aug 2004


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