Femtosecond TALIF Imaging of Atomic Hydrogen in Pulsed, Non-Equilibrium Plasmas
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© 2014, American Institute of Aeronautics and Astronautics Inc. All rights reserved. In recent decades significant interest has been paid to investigate the applications of non-equilibrium plasma discharges to a variety of practical combustion related applications. However in order to develop a more fundamental understanding of such phenomena, additional insight into important kinetic processes is of great importance. A two-photon absorption laser-induced fluorescence (TALIF) technique is developed utilizing wide-bandwidth, short-time duration, femtosecond (fs) laser pulses. Due to its increased bandwidth and short pulse duration, fs-TALIF has reduced impact from photo-dissociation and increased signal compared to traditional nanosecond TALIF schemes. This fs-TALIF technique is used to image key atomic species within nanosecond pulsed, non-equilibrium discharges at moderate pressures. These two dimensional results provides both spatial and temporal information that can be used in more predictive plasma kinetics models.
author list (cited authors)
Schmidt, J. B., Kulatilaka, W. D., Roy, S., Frederickson, K., Lempert, W. R., & Gord, J. R.