Abstract
High-resolution optical spectroscopy was used to study the growth of continuously excited surface acoustic waves under 15- and 25-finger-pair aluminum interdigital transducers on y-cut z-propagating lithium niobate. The observed exponential growth of the surface wave with distance is in agreement with simple coupled-mode theory. The coupling parameter leads to a direct evaluation of the effective electromechanical coupling constant K. For yz LiNbO3 a value of K2=0.030±0.003 was found.
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