The spatial fidelity of amplified images in photorefractive materials due to spatial gain
variations with computation and experiment based on BaTiO 3 is investigated. The results …

The spatial fidelity and the gain in coherent amplification of images by two-wave coupling in
a photorefractive crystal are qualitatively investigated. The spatial fidelity is degraded mainly …

The process of high-gain image amplification in photorefractive crystals is investigated. We
show that in the regime of large energy transfer, the spatially nonuniform depletion of the …

Based on the feature that a signal grating has faster formation rate than noise gratings, we
have demonstrated that in the presence of a beam with a frequency different from that of the …

Edge enhancement, a type of optical image processing, is performed in a photorefractive
material in real time and with low incident-light intensities (10^− 3 W/cm^ 2). We calculate …

A scheme is described for removal of beam fanning, which is noise in the amplified image,
by two-beam coupling in a photorefractive BaTiO 3 crystal. The large time constant of the …

We numerically studied the spatial fidelity of coherent image amplification by two-wave
mixing configurations in photorefractive BaTiO_3: Ce using a three-dimensional analysis …

We present a two-beam coupling configuration in photorefractive BaTiO_3 that provides a
low-noise amplification of the signal to be detected. A two-wave mixing gain of 100 is …

Coherent image amplification by two-wave coupling in a crystal of photorefractive BaTiO3 is
analyzed. This amplifier is optimized with respect to such operational characteristics as gain …

We propose and demonstrate a method for the dynamic-range compression of images using
two-wave mixing in photorefractive materials. This method, in which an image is carried on …