Abstract
The theory of three-field acoustic interactions in nonlinear piezoelectric crystals predicts that the second-harmonic acoustic wave is accompanied by the second-harmonic electric potential wave due to the electroacoustic nonlinearities of the media. An experiment to demonstrate the phenomenon carried out for crystal LiNbO3 is described in this letter. Ultrasonic waves excited by a 30 MHz quartz transducer propagate along the z direction of LiNbO3 crystal. The nonlinear electric potential wave accompanying with the acoustic wave is directly detected by use of the capacitive detector. To the author’s knowledge, this kind of observation has not been made before.
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