Sound excitation by the laser-induced breakdown in a liquid with microinhomogeneities

The excitation of sound in a heterogeneous liquid by the breakdown induced by a laser pulse is studied theoretically. The heterogeneity stems from the presence of microparticles with various sizes. The microparticles form clusters representing multifractals. The size distribution of the microparticles is described by a power function, reflecting the scale invariance of fractals. Dependence of the acoustic signal amplitude on the fractal dimension of clusters, the probability density function of the microparticle size distribution, and the laser pulse energy is discussed.