Diffraction characteristics of laser-induced acoustic waves in liquids

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Abstract
The effect of diffraction on the temporal shape of laser-excited plane acoustic waves propagating in liquids is studied both theoretically and experimentally. Two different boundary conditions corresponding to a constrained and a free surface of the liquid are considered. The main features are the development of a rarefaction zone behind the pure compression pulse in the first case and the appearance of a second compression zone following the original compression/rarefaction signal in the second case. Experiments have been performed in distilled water with a hybrid CO2 laser and piezoelectric detection of the acoustic transients. A good agreement between theory and experiment is found.

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