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VOLUME 20 (1974) | ISSUE 7 | PAGE 453
Superheterodyne amplification of surface ultrasonic waves in a monolithic layered piezoelectric-semiconductor structure
We present some results of an experimental study of the nonlinear interaction between ultrasonic surface waves of two different frequencies in a monolithic layered structure made up of lithium niobate and CdSe films under supersonic electron drift. It is observed that the electron amplification coefficient of a 28-MHz elastic surface wave increases in the presence of an intense 95-MHz wave at a definite conductivity of the CdSe film. Generation of elastic surface waves at the sum and difference frequencies (123 and 56 MHz, respectively) is observed in this case.