Abstract
Previous investigations of flash duration for single bubble sonoluminescence (SBSL) events in water have shown emission pulse widths on the order of 30–300 ps. The spatial extent of the light-emitting region in SBSL has not been successfully resolved, but it is less than 1 μm. Here we report temporal and spatial observations of light emission from laser-nucleated, compact bubble clouds at high static pressure. Employing high-speed imaging and PMT monitoring, we observe events with durations on the order of 50 ns, whose spatial extent can reach 1 mm in radius. The evolution of event size, spatial uniformity, and intensity will be monitored and compared with parametric data (maximum radius of cloud, outgoing shock velocity, static pressure, and post nucleation time) to discover correlations between light emission and hydrodynamics. [Work supported by the Impulse Devices, Inc.]
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