The acoustic phase conjugate wave was generated at 56 MHz by nonlinear electroacoustic interaction in LiNbO3 and its field was visualized with the schlieren technique. The field distribution of the phase conjugate wave was observed to be very close to that of the incident wave, and the time-reversal property of the phase conjugate waves was experimentally confirmed for the first time.
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Ohno et al. (1992) studied this question.
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