Cu:KNSBN晶体生长及其光折变效应的研究  

Study on Growth and the Photorefractive Effect of Cu:KNSBN Crystal

作　　者：荣宪伟[1] 刘欣荣[2] 赵朝中[1] 关承祥[1] 

机构地区：[1]哈尔滨师范大学理化学院物理系,哈尔滨150080 [2]哈尔滨工业大学应用化学系,哈尔滨150001

出　　处：《人工晶体学报》2006年第2期253-256,共4页Journal of Synthetic Crystals

基　　金：黑龙江省教育厅资助项目

摘　　要：在KNSBN晶体中掺进CuO,采用硅钼棒作加热体,以Czochralsk i技术生长Cu:KNSBN晶体。以二波耦合光路,测试晶体的衍射效率和记录时间,计算折射率变化值Δn。Cu:KNSBN晶体的衍射效率,记录速度和折射率变化值皆高于Fe:L iNbO3晶体。尤其记录速度比Fe:L iNbO3晶体高一个数量级以上。测试Cu:KNSBN晶体位相共轭反射率R和自泵浦位相共轭反射率RC。Cu:KNSBN晶体的自泵浦位相共轭反射率RC值达到64%,是纯KNSBN晶体的二倍。以Cu:KNSBN晶体自泵浦位相共轭镜进行消畸变实验。实验结果表明:输出光波确系输入探测光波的位相共轭光波。Doping with CuO in the KNSBN crystal and using Si-Mo rod as heater,the Cu：KNSBN crystal was grown by Czochralski technique. The diffraction efficiency（η） and recording time τw were measured by two-wave coopling light path and the refractive index change value An was calculated. The diffraction efficiency （η）, recording speed and refractive index value △n were higher than that of Fe： LiNbO3 crystals. The recording speed of Cu ： KNSBN crystal was one order of magnitude higher than that of Fe ： LiNbO3 crystal. The phase conjugate reflectivity R and self-pumped phase conjugate reflectivity Rc were measured. The self-pumped phase conjugate reflectivity Rc of Cu ： KNSBN crystal reached 64%, which was two times the pure KNSBN crystal. Eliminating distortion experiment was carried out by using selfpumped phase conjugation mirror. The experimental results indicate that the output beam determination is a phase conjugate beam of input probe beam.

关 键 词：Cu:KNSBN晶体 光折变效应 衍射效率 

分 类 号：O734[理学—晶体学]