SAW Propagation Characteristics in Thin-Film Surface Acoustic Waveguides for Acousto-Optic Devices

Nobuo GOTO  Yasumitsu MIYAZAKI  

IEICE TRANSACTIONS (1976-1990)   Vol.E69   No.1   pp.47-55
Publication Date: 1986/01/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Optical and Quantum Electronics

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Two types of surface acoustic waveguides were studied for use in collinear acousto-optic devices. These waveguides are indispensable for integration and improvement of controll efficiency. Ta2O5 strip waveguides and Al v/v waveguides placed on optical slab waveguides on Y-X LiNbO3 were found to improve the SAW propagation properties. In particular, the SAW excited with a focused IDT was coupled into the Ta2O5 strip waveguide with the coupling loss less than 2 dB and the propagation loss less than 1 dB. The propagation properties and the beam profiles were measured by optical probing. Furthermore, phase velocities of guided waves were measured in fairly good agreement with the calculated ones.