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Refractive Index Profile Measurements of Diffused Optical Waveguides

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Abstract

Refractive index profiles resulting from the fabrication of optical waveguides by diffusion techniques are measured using a reflection interferometric technique. In Cd-diffused ZnSe waveguides, the index variations are found to be complementary error functions that closely follow the composition changes for deep (>5 μm) diffusions. Shallow (<5 μm) diffusions produce waveguides in which the index profile is a complementary error function that differs significantly from the composition profile. The relationship between composition and refractive index is determined for Cd compositions less than 10%. Refractive index profiles in commercially available diffused glass waveguides (SELFOC rod and fibers) are also described.

© 1974 Optical Society of America

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