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1 October 1991 Nonlinear optical processing using phase grating
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Intensity-to-phase modulation can be used for phase coding of an input image, instead of the commonly employed halftone technique. When placed at the entrance of a 2 f coherent system with the selected diffraction order, the phase-coded image shows nonlinear behavior. No special screen design is necessary and a simple Ronchi-type or sinusoidal gratings can be used. Using DCG, we attained an input dynamic range of three order of magnitude, a significant improvement over previous work. A multipeak transfer function was obtained by photoresist as a recording media, which is useful for equidensitometry. Generally, the phase-coding for the nonlinear optical processor is more light efficient and allows a real time implementation with an erasable photopolymer material.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Lev S. Sadovnik, Olga Demichovskaya, and Ray T. Chen "Nonlinear optical processing using phase grating", Proc. SPIE 1545, International Conference on the Application and Theory of Periodic Structures, (1 October 1991);

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