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A review of the theory of the natural waves (eigen-modes) in a dielectric sphere is presented. A special attention is paid to the eigenmodes with large radial and azimuthal indices, the so-called whispering-gallery modes. The experimental results of the spectroscopic study of modes in a dielectric sphere are reported. The fields of applications of whispering-gallery modes are discussed.
Anatolii N Oraevsky (Fri,) studied this question.