Abstract
Experimental investigations of pulses of longitudinal acoustic waves generated in a metal by short laser pulses are presented. The beam pattern of acoustic radiation, the amplitudes and shapes of acoustic pulses as functions of the laser radiation intensity and laser spot dimension are discussed. The results are analyzed in terms of the model of a thermoacoustic emitter in the form of a heated disk generating a pulse of axial and radial stress through the thermoelastic and hydrodynamic mechanisms.
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