Acoustooptic interaction in a diffused waveguide with a dielectric film

An analysis is made of the acoustooptic interaction in a layer structure comprising an optical diffused waveguide and a dielectric film having a refractive index higher than the maximum refractive index in the waveguide. It is shown that the deposition of a dielectric film increases the acoustooptic interaction coupling coefficient and shifts the maximum of its frequency dependence toward higher surface acoustic wave frequencies.