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.
| Original language | English |
|---|---|
| Pages (from-to) | 1873-1875 |
| Number of pages | 3 |
| Journal | Optics Letters |
| Volume | 29 |
| Issue number | 16 |
| DOIs | |
| Publication status | Published - 15 Aug 2004 |