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Fraunhofer diffraction to determine the twin angle in single-crystal BaTio3

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Abstract

We present a new method for determining the electrically induced twin angle α of a (100) bulk single crystal of barium titanate (BaTiO3) using a nondestructive optical technique based on Fraunhofer diffraction. The technique required two steps that were performed simultaneously. First, we analyzed the diffracted light intensity captured with a line camera. Second, we measured the size of the diffracting element by analyzing images of the crystal’s surface taken with a CCD camera. The value obtained for the twin angle is 0.67° ± 0.05°, which compares favorably with the theoretical value of 0.63°.

© 2003 Optical Society of America

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