This work was supported in part by the National Science Foundation.
Gaussian beams, Inhomogeneous materials, Light -- Refraction, Optical wave guides
Vector wave solutions are obtained for the propagation of beams of light in media having slow spatial variations of the gain, loss, or index of refraction. The formalism developed here is applicable to a wide range of problems, and an exa mple considered in detail is the propagation of off-axis beams in lenslike laser materials and optical waveguides. A procedure is also described for the diagnosis of localized dielectric inhomogeneities such as plasmas by means of Gaussian laser beams.
Lee W. Casperson, "Gaussian Light Beams in Inhomogeneous Media," Appl. Opt. 12, 2434-2441 (1973).