Abstract
Surface acoustic wave (SAW) velocities were measured as a function of angle on both GaAs (001) and GaAs (111) crystal cuts. Surface acoustic wave packets were generated by a pulsed nitrogen laser beam focused into a line shape on the sample surface. The SAWs were detected by a PVDF foil with steel wedge transducer at different propagating distances. The system was automated to measure SAW velocity at a range of angles, and thus produces a velocity-angle (or slowness) curve. From the slowness curve the three independent elastic constants may be derived. The SAW velocity measurement setup is presented and aspects of the propagation of SAW modes for different cuts and angles are discussed. The accuracy of the elastic constants derived from SAW measurements on both cuts is examined, and other detected acoustic wave modes are discussed with regard to their origin and suitability for elastic constant measurement.
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