Ce:KNSBN光折变光纤两波耦合特性研究

刘宏利; 王肇圻; 梁宝来; 张春书; 陈焕矗

中国激光, 2002, 29 (8): 694, 网络出版: 2006-08-08

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

论文大纲

刘宏利 ^1,*王肇圻 ¹梁宝来 ¹张春书 ¹陈焕矗 ²

作者单位

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

光折变光纤两波耦合 "扇" photorefractive fiber two-wave mixing fanning

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1:1000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,二者相符.

Abstract

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.

参考文献

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刘宏利, 王肇圻, 梁宝来, 张春书, 陈焕矗. Ce:KNSBN光折变光纤两波耦合特性研究[J]. 中国激光, 2002, 29(8): 694. 刘宏利, 王肇圻, 梁宝来, 张春书, 陈焕矗. Study on Properties of two-wave Coupling with Ce:KNSBN Photorefractive Fiber[J]. Chinese Journal of Lasers, 2002, 29(8): 694.

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