In-Plane Scattering In LiNbO3 Waveguides

David W. Vahey

doi:10.1117/12.957220

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26 July 1979 In-Plane Scattering In LiNbO₃ Waveguides

David W. Vahey

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Proceedings Volume 0176, Guided Wave Optical Systems and Devices II; (1979) https://doi.org/10.1117/12.957220
Event: Technical Symposium East, 1979, Washington, D.C., United States

Abstract

Experimental observations of the in-plane scattered energy distribution in Ti-diffused LiNb0₃ waveguides have been performed with a view toward determining and subsequently eliminating sources of scattering in this material. Results suggest that scattering from refractive-index variations is more important than scattering from surface roughness in commercial samples. However, scattering from contaminants at or near the surface exists and can be reduced by using less Ti diffusant and/or by polishing the finished waveguide. Variations in scattering as a function of propagation direction and mode polarization suggest that the scattering centers are anisotropic with regard to either their refractive index, their shape or both. Diagnostic experiments to ascertain the nature of these scatterers, including electrooptic, photorefractive, and thermal studies, are described.

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David W. Vahey "In-Plane Scattering In LiNbO₃ Waveguides", Proc. SPIE 0176, Guided Wave Optical Systems and Devices II, (26 July 1979); https://doi.org/10.1117/12.957220

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