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A localized increase in the refractive index of ferroelectric crystals has been accomplished by the use of static strain induced from a surface film. The technique does not require alteration of substrate composition by diffusion or ion exchange1-3. Optical waveguides have been produced by this method in LiNb03, LiTa03 and BaTi03. This represents the first formation of waveguides in BaTi03> which is ideally suited for making compact low-voltage polarization control guided-wave devices and optical filters due to its large г electrooptic coefficient.

© 1992 Optical Society of America

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