Abstract
Second-harmonic generation was observed in an elastic surface wave propagating in the y direction on the x surface of α-quartz. The waves were generated and detected by means of interdigital electrode transducers. The fundamental frequency was 9 MHz. The amplitude of the second-harmonic signal increased linearly with distance along the crystal surface. A nearly perfect square-law dependence of second-harmonic power on fundamental power was found. The ratio of second-harmonic to fundamental power was −43.8 dB at a distance of 2.2 cm and a fundamental input power of 1 W. The results are in quantitative agreement with theory.