Influence of the parameters of a diffused waveguide on the frequency dependence of the acoustooptic interaction efficiency

An investigation is made of the influence of the parameters of a diffused waveguide on the surface of $Y$-cut lithium niobate, having a profile described by a Gaussian function, on the acoustoopic interaction efficiency of $TE$ modes. Changes found when the Gaussian profile is replaced by an exponential or a parabolic profile are indicated. Examples of the use of these results in the design of acoustooptic devices are given.