Ce∶KNSBN光折变光纤两波耦合特性研究  

Study on Properties of two-wave Coupling with Ce∶KNSBN Photorefractive Fiber

作　　者：刘宏利[1] 王肇圻[1] 梁宝来[1] 张春书[1] 陈焕矗[2] 

机构地区：[1]南开大学现代光学研究所教育部光学信息技术科学开放研究实验室,天津300071 [2]山东大学晶体材料研究所,山东济南250100

出　　处：《中国激光》2002年第8期694-698,共5页Chinese Journal of Lasers

基　　金：国家自然科学基金 (批准号 :6 0 1770 0 6 )资助项目

摘　　要：研究了掺铈钾钠铌酸锶钡 (Ce∶KNSBN)光折变光纤“扇”特性及两波耦合的基本特性。通过实验发现 ,当入射光的入射角为 8°左右时 ,“扇”最小 ,这与块状晶体有根本的不同。在信号光与抽运光的入射夹角 2θ小于 11°时 ,两波耦合增益随入射夹角的增大而增大 ,而当入射夹角大于 11°时 ,两波耦合增益随着入射夹角的增大而迅速减小。给出了在各个不同的入射夹角下 ,两波耦合增益中透射的信号光的时间特性曲线。两波耦合增益随信号 抽运比的增加而增加 ,在入射夹角为 8° ,信号 抽运比为 1∶10 0 0时 ,两波耦合增益达到了 77,比块状晶体相应条件下提高了 4倍。用两波耦合的理论公式对增益随信号 抽运比的实验数据进行了拟合 。Properties of fanning effect and two wave coupling in a Ce∶KNSBN photorefractive fiber were studied. It is found that the fanning is weak when the incident angle is about 8°, which differs from that in a bulk crystal. Two wave coupling gain increases as the angle between pump beam and signal beam increases when the angle is less than 11°. It decreases as the angle increases when the angle is greater than 11°. The time evolution of transmitting signal beam at different angles was also given. The two wave coupling gain is 77 in the conditions that the angle is 8° and the signal to pump beam intensity ratio is 1∶1000, which is about 4 times that in a bulk crystal in the same conditions. The theoretical fitting and the experimental data are coincident quite well.

关 键 词：Ce:KNSBN 光折变光纤 两波耦合 “扇”特性 掺铈钾钠铌酸锶钡 

分 类 号：TN253[电子电信—物理电子学]