EDGE ENHANCEMENT OF A PHASE-CONJUGATE IMAGE WITH A MUTUALLY PUMPED PHASE CONJUGATOR

Usually edge enhancement of optical images is produced by introduction of loss into the low spatial frequency components of the image-bearin g beam in the Fourier plane of a lens. We report on edge-enhanced phas e-conjugate images from a mutually pumped conjugator accomplished by s patial filtering in the Fraunhofer diffraction region of the input bea ms. High-resolution (128-160 lines/mm) edge-enhanced images are obtain ed through traditional spatial filtering in the Fourier plane and in t he Fraunhofer regime. Amplification of these edge-enhanced images is o bserved with some loss of high spatial resolution (50 lines/mm). (C) 1 996 Optical Society of America