Observation of bulk waves in surface acoustic wave device by frequency-shift holography

Abstract

The radiation patterns of bulk waves generated by an interdigital transducer and their reflection patterns at the bottom plane of a Y-cut Z-propagating LiNbO3 have been observed clearly on the crystal using a frequency-shift-holography method. The effects of polarization of the observing light of this method and the effect of roughing the bottom plane of the crystal have been studied.