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Four-dimensional x-ray measurements are demonstrated in an optically complex spray using three x-ray sources and three high-speed imaging systems. Time-evolving volumes are reconstructed from the quantitative two-dimensional path length data.

Simultaneous 10-kHz OH-PLIF/CH2O-PLIF/PIV (Rayleigh scattering) measurements in DRL-A non-premixed flames were demonstrated using a three-leg burst-mode laser system. High-speed multi-species concentrations, heat-release rate, and flow velocity field (temperature) were measured.

Three-dimensional concentration-field measurements are demonstrated using volumetric laser illumination of turbulent flows at 20 kHz. High-speed intensified cameras coupled with stereoscopes are used to collect fourteen simultaneous views of acetone laser-induced fluorescence for tomographic reconstruction.

Volumetric burst-mode-laser illumination is used to excite laser-induced incandescence of soot and laser-induced fluorescence of combustion intermediates at 1064 nm and 355 nm. Tomographic reconstruction allows 10-kHz or higher, three-dimensional, spatiotemporal investigation of turbulent flames.

We demonstrated high-speed flame temperature measurements with high temporal and spatial resolution based on coherent anti-Stokes Raman scattering (CARS) spectroscopy at a rate of 100 kHz employing a picosecond burst-mode laser.

Three-dimensional concentration fields are demonstrated using tomographic reconstruction of volumetrically illuminated turbulent flows at 20 kHz. High-speed intensified cameras coupled with vertical stereoscopes collect fourteen simultaneous views of acetone fluorescence.

Burst-mode pulse energies exceeding 1 Joule at 10 kHz along with 100-millisecond tailored burst profiles (1,000-10,000 pulses) are produced using temporally adjustable oscillator and amplifier technology enabling high-fidelity measurements and analyses in turbulent flows. Article not available.

We report on a femtosecond-OPO based multimodal nonlinear optical microscope that permits multiphoton fluorescence, SHG, THG, CARS, and stimulated Raman scattering imaging on the same platform.