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The initial stage of laser-radiation-induced damage to the surface of transparent dielectrics was investigated by electron microscopy and by a study of the disturbed specular reflection under prebreakdown conditions. The deformation of the surface was found to occur before the appearance of a spark. The damage started at isolated points which were evidently structure defects. The various stages of the surface damage of transparent dielectrics were determined.
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Fersman et al. (1971) studied this question.
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