Abstract
Abstract : Two separate non-linear effects which influence pulsed laser propagation and target interaction have been studied, e.g., laser supported combustion wave (LSC) propagation and laser-induced gas breakdown. A theoretical model describing LSC propagation and which includes the non-linear contributions of the plasma transport and thermodynamic coefficients throughout the wave profile has been developed. The model is one-dimensional and the system of equations is solved by use of the method of quasilinearization. The model uses the deflagration approximation which implies that pressure balance with the atmosphere exists. Numerical results of our calculations are in good quantitative agreement with available experimental data. Experiments also have been performed to determine the effect of particulate matter on laser-induced air breakdown for Nd laser wavelengths (1.06 micrometer) and for pulse widths of 30 nsec. The breakdown thresholds for air in the presence of SiO2 and carbon fibers of 9 micrometer, 6.6 micrometer and 68 micrometer diameters were measured.
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