Image Enhancement in Coherent Optical Amplification by Photorefractive Crystals

Danyu Chen, Fengchun Tian, Ying Liu, Youwen Hu, Liang Han

College of Communication Engineering, Chongqing University, Chongqing, China.
College of Communication Engineering, Chongqing University, Chongqing, China..

DOI: 10.4236/jcc.2014.22008                

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 enhancement have been analyzed. As an example, the effects of these factors in a given photorefractive crystal have been studied through simulation.

Keywords

Coherent Optical Amplification; Photorefractive Effect; Image Enhancement; Unevenness of Gain

Conflicts of Interest

The authors declare no conflicts of interest.

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