Abstract
Using high-speed digital imaging, the evolution of laser-nucleated bubble clouds over multiple acoustic cycles is observed. Five 7×7 custom phase gratings are employed to produce 245 beams, which are then focused into the center of a spherical resonator capable of high static and acoustic pressure. The dependence of the evolution of the bubble cloud on several system parameters is measured. Notably the resulting cloud(s) depend strongly on the phase of the laser firing, the laser energy per pulse, and the acoustic pressure. Number of bubbles, radius of individual bubbles, and effective radius of clouds will be reported as functions of time. The interplay between cloud dynamics and shock waves will also be discussed. [Work supported by Impulse Devices, Inc.]
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