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外电场对SBN:Cr晶体二波耦合特性的影响及应用 被引量:2

Influence of external electric field on photorefractive two-wave coupling in SBN:Cr crystal and its applications
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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 。 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.
出处 《物理学报》 SCIE EI CAS CSCD 北大核心 2004年第11期3756-3760,共5页 Acta Physica Sinica
基金 国家自然科学基金 (批准号 :60 0 770 18)资助的课题~~
关键词 二波耦合 外电场 晶体 光折变 相关识别 联合变换相关器 外加电场 增益系数 放大原理 响应速度 SBN:Cr crystal, photorefractive two-wave coupling, edge-enhancement, joint-transform correlator
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参考文献14

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同被引文献19

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