An optical crystal (a multilayer diffraction plate) which optically simulates electron diffraction by thin crystals has been developed. The lattice was constructed with appropriate lattice constants to allow a direct optical simulation of electron diffraction by mica. The resulting optical-diffraction patterns agree with theory and vividly illustrate Laue zones. Optical-diffraction patterns for different crystal orientations are directly compared to electron-diffraction patterns for the same orientations of a thin mica crystal. The breadths of Laue zones diminish as a crystal becomes thicker, reducing the diffraction pattern to the Laue spots described by Bragg’s law.

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