Proceedings PaperNonlinear Optoacoustic Underwater Sound Source
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Certain nonlinear optoacoustic generation processes at the water surface were investigated, using a Nd:glass laser operating at a wavelength of 1.0611 as the optical energy source. A new theoretical model called the equilibrium blast model was developed based on the hydrodynamic equations of equilibrium. The conditions at the shock fronts are determined by the maximum entropy condition, and the distribution of energy within the blast is assumed to be through thermal conduction. The model predictions were compared with experimental data. From the experimental results, three distinct processes have been identified: the weak blast, the thermal conduction limited blast, and the emission limited blast. The last deserves further study from a basic physics point of view and from an applications standpoint.