Spatial auto-convolution operation with anisotropic diffraction in BaTiO₃ photorefractive crystal

Ching-Cherng Sun^1,2 and Chih-Yuan Cheng^1
1Department of Optics and Photonics, National Central University, Chung-Li, 32054 Taiwan
²Department of Electrophysics, National Yang Ming Chiao Tung University, Hsin-Chu, 30010 Taiwan

Dedicated to Professor Nikolai Kukhtarev

Leveraging Kukhtarev’s equations for describing the photorefractive effect, we have been able to observe a remarkable optical phenomenon in BaTiO₃, including the identification of the most significant refractive index change. This substantial change in refractive index facilitates a pronounced response under a specific incident condition known as anisotropic self-diffraction (ASD). ASD permits the writing beam in e-polarization to diffract into o-polarization at the -1-order diffraction. By employing BaTiO₃ as a dynamic Vander Lugt filter within the ASD framework, we conducted the auto-convolution of the input image. This approach not only demonstrates the unique capabilities of BaTiO₃ in facilitating complex optical processes but also showcases the potential of ASD in advanced optical applications. © Anita Publications. All rights reserved.
Doi: XXXXX
Keywords: Kukhtarev equations, Photorefractive effect, BaTiO₃, Anisotropic self-diffraction.

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