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Precise determination of refractive index and thickness in the Ti-diffused LiNbO3 waveguide

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Abstract

Diffusion depth and maximum refractive index change in the Ti-diffused LiNbO3 waveguide have been determined using a prism coupling method that takes into account the measuring accuracy. Calculation has been carried out by putting only the mode synchronous angles, measured with a GaP prism, into the computer program based on Marcuse’s WKB approximation. Results on LiNbO3 waveguide parameters are Δne = 0.007, d = 4.1 μm, and Δn0n0.005, d = 6.6 μm, respectively, under the Ti metal (500 Å) diffusion at 1100°C for 10 h in air.

© 1978 Optical Society of America

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