【摘要】 对固液同成分SBN :Cr(Sr0 6 1 Ba0 39Nb2 O6 :Cr)晶体在外加直流电场作用下的光折变二波耦合特性及其应用进行了实验研究 ,分析了晶体的二波耦合强度增益系数随外电场变化的趋势 ,并给出了实验测量结果 .发现在适当的外电场作用下 ,晶体的光折变二波耦合增益和响应速度可以得到一定程度的提高 .进一步的研究表明 ,这种电场响应特性有助于改善SBN :Cr晶体的某些应用性能 .利用该晶体通过光折变二波耦合非线性放大原理实现光学图像边沿增强时 ,通过给晶体沿轴向施加适当的外电场 ,可进一步提高图像边沿增强效果 ;在基于光折变边沿增强预处理的联合变换相关器中 ,适当的外加电场可进一步改善联合变换相关器的相关识别性能更多还原

【Abstract】 The properties and applications of the photorefractive two-wave coupling in congruent SBN:Cr(Sr 0.61Ba 0.39Nb 2O 6:Cr)crystal under external dc electric field are experimentally investigated in this paper.The variation of the intensity gain coefficient of the two-wave coupling with the external field is analyzed,and the measurement results are presented.It is found that the photorefractive two-wave coupling gain and response rapidity can be both increased,by applying appropriate external electric field to the crystal.Further study indicates this electric response property of SBN:Cr crystal is useful to some applications,such as improving the image edge-enhancement and the image edge-enhancement joint-transform correlator based on the nonlinear energy transfer of photorefractive two-wave coupling in the crystal.更多还原