Optical EngineeringHolographic Fourier synthesis of dynamic Moiré-like patterns in the photorefractive Bi12TiO20 crystal
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We propose and physically discuss a kind of holographic Fourier synthesis in the profile of dynamic Moiré-like patterns. The interference patterns are obtained by progressively controlling the superposition of more than two dynamic sinusoidal phase gratings. It represents a new holographic optical nondestructive testing routine in real time for metrological purposes. The sinusoidal phase gratings with slightly different pitches are dynamically generated by photorefraction in the Bi12TiO20 (BTO) crystal sample. The photorefractive holographic medium is used in anisotropic self-diffraction configuration and in a diffusion-only recording mechanism.