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Image Transmission by an Optical System with a Lens-like Medium

Image transmission by an optical system with a lens-like medium which has a square-law distribution of dielectric constant was investigated both theoretically and experimentally to see if this system could be applied to coherent optics. The equation describing the field transformed by this system was obtained on the basis of wave optics. It became apparent that not only an imaging condition but also a Fourier transform condition are derived from this equation. Some experiments performed on the image transmission and Fourier transform using SELFOC fibers, and measured results were compared with theoretical ones. The limits on the pass band of spatial frequencies were obtained in terms of off-axis point images in cases, in which the diameter of a medium was finite, and in other cases where a medium had square-law absorption.