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Instability of high-power light field in dielectric microsphere

A model to describe localization of high-power electromagnetic field and abrupt increasing its amplitude in nonabsorbing dielectric inclusion in transparent medium is presented. It is based on formation of unstable field structure in dielectric microsphere. Possibility for field instability to arise is estimated making use of model of diffraction of high-amplitude plane wave on sphere which radius is about radiation wavelength. There are estimated threshold amplitude of incident wave and field amplification in microsphere. Physical reason for the instability to develop is considered and shown to be connected with formation of positive feedback arising with light-induced formation of microsphere's eigenmodes.