Abstract

AbstractSurface acoustic wave parametric oscillation due to the backward nonlinear process in a surface acoustic wave convolver is an interesting phenomenon and various applications have been considered. This paper discusses the theory and experimental results with a SAW reflector design with a low oscillation threshold, using a Si/LiNbO3 substrate, which yields the highest convolution efficiency. The results show that the oscillation threshold power can be greatly reduced by using reflectors (threshold power is reduced to 1/30 for a reflection coefficient of 0.75, as compared with the reflectionless case). In the experiment oscillation could be achieved with such low input power that the oscillation threshold was only 14.4 dBm, and thus SAW parametric oscillation is possible. Also, the experimental oscillation characteristics agree well with theory.

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