2014
DOI: 10.4236/jcc.2014.22008
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Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Abstract: In this paper, a model of two-wave mixing in the photorefractive crystal, which takes account of the difference in spatial frequency in a beam, has been built to study the image enhancement effect in coherent optical amplification. Based on the theoretical analysis of the model, the gain distribution for each pixel in the signal beam has been obtained. It shows that the unevenness of the gain is induced by the difference in spatial frequency in the beam. The factors that impact on the uniformity of image enhan… Show more

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Cited by 2 publications
(2 citation statements)
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“…Coherent intensity enhancement of the images of faint objects is of interest for various practical applications, including detection and tracking of distant objects [1], imaging biological substances, laser marking, and many others [2,3,4]. Stimulated emission is the physical process that can provide the mechanism of optical amplification of light-waves while propagating through a medium with an inverted carrier population.…”
Section: Introductionmentioning
confidence: 99%
“…Coherent intensity enhancement of the images of faint objects is of interest for various practical applications, including detection and tracking of distant objects [1], imaging biological substances, laser marking, and many others [2,3,4]. Stimulated emission is the physical process that can provide the mechanism of optical amplification of light-waves while propagating through a medium with an inverted carrier population.…”
Section: Introductionmentioning
confidence: 99%
“…The quality of video images captured in appropriate illumination scenes will be much better. However, when video surveillance is applied in actual cases, the quality of images is unsatisfactory due to the uncontrollable environment [1,2]. The collected images will demonstrate dark and low contrast overall in low illumination, and human eyes can hardly perceive the useful information.…”
Section: Introductionmentioning
confidence: 99%