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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 ,二者相符
The basic characteristics of “fan” and two-wave coupling of cerium-substituted potassium and sodium barium strontium barium niobate (Ce:KNSBN) photorefractive fiber were studied. It is found experimentally that when the incidence angle of incident light is about 8 °, the “fan” is the smallest, which is fundamentally different from the bulk crystal. When the incident angle 2θ of the signal light and the pump light is less than 11 °, the coupling gain of the two waves increases with the increase of the incident angle. When the incident angle is greater than 11 °, the two-wave coupling gain increases with the incident clip The angle increases rapidly and decreases rapidly. The time characteristics of the signal light transmitted in the two-wave coupling gain at different angles of incidence are given. The coupling gain of two waves increases with the increase of signal pumping ratio. When the incident angle is 8 ° and the signal pumping ratio is 1:10 0 0, the coupling gain of two waves reaches 77, which is higher than that of bulk crystal 4 times. The theoretical data of two wave coupling are used to fit the experimental data of the gain with signal pumping ratio,