A photorefractive image amplifier: Characteristics and evaluation
Abstract
Low-noise amplification with small laser intensities may be achieved by two-wave mixing (2WM) in a photorefractive crystal. The photorefractive effect is a bulk phenomenon wherein the local index of refraction is changed by the presence of an interference pattern inside the medium.
Gray-scale images were successfully amplified by 2WM in a BSO crystal. Amplified images were observed to have higher gray values with an average relative gain of 5.9 and enhanced image edges. The overall brightness increased by a factor of 2.7, with a corresponding improvement in the image contrast range. The amplifier response function for a focused image demonstrates sensitivity at higher spatial frequencies along the x-axis and has an approximately constant value, indicating fidelity of image information.
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