Work supported in part by the National Science Foundation
Journal of the Optical Society of America
Wave functions, Ultrashort laser pulses, Electromagnetic fields -- Mathematical models
Vector wave solutions are derived for the electromagnetic modes of a sphere having radial variations of the refractive index and gain. For some inhomogeneity models, confined-mode solutions exist. The results are applicable to the refracting atmospheres of stars and planets.
Lee W. Casperson, "Electromagnetic modes of an inhomogeneous sphere," J. Opt. Soc. Am. 65, 399-403 (1975).