The interaction of a pulse from a Q-switched laser with a metal in water is the basis for the laser peening process where the metallurgical properties are modified. An investigation of the process, using schlieren imaging, shows that high-frequency ultrasound is generated when the metal is in the form of a thin plate. The period of the ultrasonic waves in the water is given by the plate thickness and the velocity of longitudinal sound waves in the metal. Ultrasonic wave trains with a frequency of 7.5 MHz up to 10 μs long are shown.
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Don-Liyanage et al. (2001) studied this question.
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