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It is known that ferroelectric domain inversion can occur at the positive face when c-cut lithium niobate is treated at temperatures near the Curie-temperature [1]. Domain inversion has also been noted as a problem during waveguide fabrication based on titanium indiffusion, which requires high diffusion temperatures [2,3,4]. The titanium was seen to affect the inversion process.
© 1989 Optical Society of America
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