Uniformity of image amplification by two-wave mixing in photorefractive crystals

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

doi:10.1117/1.oe.53.3.033106

Abstract

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

Highlights

Two-wave mixing, as an interesting phenomenon of great research and application value in nonlinear optics, has received growing interest in the past four decades
Two-wave mixing can be explained as the nonlinear interaction of intensity and phase between two incident beams through the photorefractive effect.[1,2,3]
The uniformity of image amplification by two-wave mixing in photorefractive crystal, which takes the difference in spatial frequency in a beam into account, has been studied in detail

Summary

Introduction

Two-wave mixing, as an interesting phenomenon of great research and application value in nonlinear optics, has received growing interest in the past four decades. As for two-dimensional (2-D) image amplification, it is a practical way to make use of photorefractive crystals in two-wave mixing arrangements because of the relative convenient operation and the potential for high gain.[9,10,11] To achieve high-quality image amplification, the value of gain needs to be considered and the uniformity of the amplification for each pixel in the image, which takes account of the difference in spatial frequency in a beam. The uniformity of image amplification by two-wave mixing in photorefractive crystal, which takes the difference in spatial frequency in a beam into account, has been studied in detail

Theoretical Analysis

Simulation and Discussion

Conclusions