Abstract
Due to the strong energy focusing found in sonoluminescence, there is much interest in high-energy bubble collapses. There is evidence in the literature that the collective collapse of a bubble cluster is more violent than a single bubble collapse under similar conditions. Precise control over the spatial and temporal placement of bubbles in an acoustic field would seem critical for achieving the strongest collapses, but nucleating bubbles acoustically is not precise or repeatable and does not allow for the creation of arrays of bubbles. A method is presented for creating two- and three-dimensional bubble arrays in a controllable way. A pulsed Nd:YAG laser is used with custom diffraction gratings and focusing optics to nucleate bubble arrays in a spherical resonator at high static pressure. A specific implementation will be presented, along with results addressing uniformity and repeatability. [Work supported by the US Army Space and Missile Command.]
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