Abstract
The first experimental observation of the cuspidal structure in the surface acoustic wave (SAW) front propagating from a point source in a crystal is reported. Nanosecond SAW pulses are generated on the (111) surface of GaAs by focused nanosecond laser pulses and detected with a cw probe laser beam. Multiple SAW arrivals are observed in the cuspidal region near the $〈11\overline{2}〉$ direction. A peak of the SAW amplitude due to ``phonon focusing'' is observed in the cusp direction. The measured SAW wave forms are well described by a model calculating the surface response to a localized pulsed force.
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