Nondirectional glow of transparent dielectrics under the action of laser radiation

The results are given of an experimental investigation of the radiation emitted by transparent dielectrics due to the passage of a laser beam. A number of properties of this radiation resembled luminescence with a wide spectrum (exceeding 10 000 cm^–1). In nonlinear crystals some of this radiation could be due to the scattering of parametric luminescence by inhomogeneities.