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9 November 1993 Direction-dependent filtering using self-pumped phase conjugation
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A new direction-dependent spatial filtering is presented with a self-pumped BaTiO3 crystal as an optical phase conjugator in two different geometries. In the first geometry, an input object (e.g., the letter K) is focused into the crystal by a Fourier transforming lens. As the crystal was located at the back focal plane of the lens, the vertical edges of the object orthogonal to the plane of incidence became most significantly enhanced. Other deviated from the orthogonal direction gradually fell off in brightness. Much better performance in speed and system control could be achieved with the second geometry where a reference beam along with a spatial filter forms gratings inside the crystal and the object beam focuses toward the gratings. The direction-dependency was then achieved with a long-narrow spatial filter oriented horizontally in the reference beam. The result is a high speed direction-dependent edge enhancement. The effect of the filter size on the performance is also discussed.
© (1993) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yim-Kul Lee, Hyung-Wook Jeon, Jung-Young Son, Myong-Wook Kim, and Jae-Chul Cho "Direction-dependent filtering using self-pumped phase conjugation", Proc. SPIE 2026, Photonics for Processors, Neural Networks, and Memories, (9 November 1993);

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