Abstract

Since the index of refraction of AgClxBr1-x x<1 is higher than that of AgCl, by diffusing Br- ions into AgCl it was possible to control the index and thus obtain planar waveguides made from silver chlorobromide (AgClBr) on a AgCl substrate. Silver halides are transparent in the mid IR, and it was therefore possible to characterize the waveguides by transmission of 10.6μm CO2-laser radiation through them. In a typical case, the thickness was optically measured and was found to be 65 μm, and the propagation loss was 16  dB/cm. The output-beam profile distribution was determined experimentally and found to be well correlated with a numerical analysis simulation based on a ray-tracing model of the eikonal equation. Planar waveguides that are transparent in the mid IR will likely be useful in numerous applications.

© 2001 Optical Society of America

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