We propose what we believe to be a novel and simple method for optical symmetry filtering, using anisotropic self-diffraction in BaTiO<sub>3</sub> crystals. This method allows us to distinguish a centrosymmetric pattern from a noncentrosymmetric pattern easily with scale invariance. It is self-referential; no extra reference element is required. Both the theory and the experiment are demonstrated.
© 1999 Optical Society of America
Ching-Cherng Sun, Bor Wang, Wei-Chia Su, Arthur E. T. Chiou, and Jenq-Yang Chang, "Optical Symmetry Filtering by Use of Anisotropic Self-Diffraction in BaTiO3 Crystals," Appl. Opt. 38, 3720-3725 (1999)