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Semiconductor surface damage, produced by a focused beam of ruby laser light, consisted of regular patterns of cracks and a system of parallel straight lines. The system of grooves (spacing of about 0.0001 cm) can be explained on the basis of diffraction effects at the focus of a lens. The regular crack patterns were related to the cleavage habits of the semiconductors by x-ray analysis. (Author)
Milton Birnbaum (Mon,) studied this question.