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Internal Cylindrical Reflexion in a Cubic Crystal

Abstract

WE wish to report an optical effect, in which a point source of light viewed through a crystal of potassium tantalate–niobate (KTN) was spread out into a ring, which passed through the source. The explanation of this effect is clear in principle but puzzling in detail.

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FORNO, C., JONES, O. Internal Cylindrical Reflexion in a Cubic Crystal. Nature 230, 375–377 (1971). https://doi.org/10.1038/230375a0

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