In this research program, Guided-wave TeO2 Acousto-Optic Devices, the propertiesof surface acoustic waves on tellurium dioxide single crystal surfaces has been studied for its potential applications as acousto-optic signal processing devices. Personal computer based numerical method has been utilized for searching of useful surface acoustic waves and for theoretical investigation of the properties of surface acoustic waves on tellurium dioxide crystal substrate. Particular emphasis is on the finding and exploration of slow surface acoustic waves for long delay time signal processing applications. The investigation also includes study of surface acoustic wave interaction with laser beams after total internal reflection beneath the surface of the crystal substrate. The usefulness of such interaction for optical signal processing applications is also investigated in comparison to similar devices using the bul slow shear waves in TeO2. Based on theoretical study results, several TeO2 substrate have ben prepared. Surface acoustic waves have been launched onto these sample substrate using edge coupled shear wave transducers. Experiments has been conducted for surface acoustic wave interaction with laser beams. Use of the acousto-optic probe, the surface acoustic wave velocity and field distribution have been obtained and compared to theoretical data. A 70 micro-second bulk slow shear wave acousto-optic beam deflector has been fabricated for comparison. Advantages of the surface acoustic wave beam deflector over bulk wave deflectors are considered. Potential applications as well as areas for further developments are recommended for a phase II development program.
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