Distribution of the intensity of surface optical waves in the focal region of a geodesic lens made of LiNbO3:Ti

An experimental investigation was made of a redistribution of the intensity in the transverse cross section of a surface optical wave focused by a spherical geodesic lens in a Ti-diffused waveguide formed in a Y-cut LiNbO₃ crystal. A wave theory of geodesic waveguide lenses was used to calculate the optical field in the focal and several other transverse cross sections for a spherical lens with parameters found experimentally. The results of these calculations were in good agreement with the experimental data.