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AMO/QO PIZZA SEMINAR


"Femtosecond Lasers for Multi-Dimensional Imaging of Atomic Species in Reacting Flows"


Dr. Waruna Kulatilaka
Mechanical Engineering, Texas A&M University

ABSTRACT 

Laser-based measurements can reveal important physical and chemical parameters such as temperature, pressure, density, velocity, and species concentration in reacting flows. Such measurements are crucial for fundamental understanding of energy release and pollutant formation processes in combustion, propulsion, energetics, and plasma systems, as well as for validating complex numerical models. However, traditional laser-based species diagnostic methods are often limited by reduced spatial dimensionality, slow data acquisition rates, and laser-induced photochemical interferences. In recent years, we have made significant advances in utilizing ultrashort, femtosecond (fs)-duration laser pulses for addressing some of these diagnostic challenges. Such diagnostic approaches represent arguably a paradigm shift in measurement bandwidth (e.g., 10 Hz to 10 kHz) and dimensionality (e.g., from point to 1D, 2D and even 3D measurements) while maintaining similar or better precision and accuracy of traditional nanosecond (ns)-duration laser techniques. This talk will highlight several recent ultrashort-pulse laser diagnostic approaches and discuss the utilization of fs-duration pulsed lasers for photolytic-interference-free, multi-photon imaging of key atomic species and reaction intermediates in flames and plasmas.


Wednesday, October 5, 2016
IQSE 578, 12:30 Noon
Mitchell Physics Building


Institute for Quantum Science and Engineering
Texas A&M University

(Pizza, salad, and soda to be served at 12:00 noon)

Host: Dr. Alexei Sokolov