We report the generation of difference-frequency acoustic surface waves by the nonlinear interaction of intersecting noncollinear surface-wave beams on [111]-cut bismuth germanium oxide, a material of suitable anisotropy. The wave vector of the mixed-frequency beam can be steered over a range of angles by varying the frequency ratio of the input beams. Agreement with a coupled-mode theory is found. It is pointed out that the effect makes a number of new surface-wave devices possible.
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Davis et al. (1972) studied this question.
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