In this paper, a numerically exact analyzing method is formulated for the diffused optical waveguide which consist of anisotropic or isotropic medium. By this analytical method, the guided modes of the diffused waveguide are determined and a measurement method for the diffusion coefficient is proposed as an application of this analysis. In the case that there is gradient of the dielectric constant, the exact analysis of the TM-modes is ordinarily difficult. In this analysis the index distribution for the anisotropic medium whose optical-axis is perpendicular to the waveguide or parallel to the waveguide-axis is sliced into multi-layers for successive numerical calculation. It is found, from the waveguides can be discussed with the equivalent film-width defined analytical results, that the propagation properties of the diffused in this paper which is analogous to that of the slab-waveguides. The diffusion coefficients and the activation energies of T1 and Ag in a fused-quartz and Vycor glass are measured with application of the analytical results.

It was found that an oxide power-epoxi resin mixture is an optimum material for surface acoustic wave absorbers oberlayed on LiNb0₃, Using a SAW device with edge reflection absorbers of this mixture for an FM discriminator, 0.05% distortion at 10.7 MHz center frequency, and 75 KHz frequency deviation, were obtained.

An optimum condition in diffusion-exchange and heat-treatment process in fabricating fibers was obtained theoretically by applying the thermal diffusion. It has been made clear that both fourth and sixth order coefficients in refractive index distribution can be their optimum values for low aberration simultaneously.