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Second‐Harmonic Generation in an Elastic Surface Wave in α‐Quartz

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1 Author(s)
Løpen, P. O. ; Division of Physical Electronics, Norwegian Institute of Technology, Trondheim, Norway

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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.

Published in:

Journal of Applied Physics  (Volume:39 ,  Issue: 12 )