基于单模光纤选模机制的单模输出6芯光纤激光器  

Pure Single Mode Output of Six-Core Fiber Laser Based on Single-Mode Fiber Mode Selection

作　　者：张晓磊[1,2,3] 彭刚定[3] 张行愚[1,2] 王青圃[1,2] 常军[1,2] 

机构地区：[1]山东大学信息科学与工程学院,山东济南250100 [2]山东省激光技术与应用重点实验室,山东济南250100 [3]新南威尔士大学电子工程与电信学院

出　　处：《中国激光》2011年第8期13-17,共5页Chinese Journal of Lasers

基　　金：International Science Linkages projects(CH060036;CG130013);山东大学自主创新基金(2009JC003)资助课题

摘　　要：为了实现多芯光纤激光器的单模输出,提出一种新的选模机制,即利用单模光纤进行选模。采用单模光纤和全反镜相结合作为选模器件,可以使6芯光纤激光器中同相位超模的耦合效率远远大于其他高阶超模,从而使高阶超模得到有效的抑制,实现高亮度的同相位超模单模输出。为了提高同相位超模的耦合效率,可以进一步优化单模光纤纤芯尺寸,同时调节单模光纤和6芯光纤之间的间隙距离。将同相位超模的耦合效率代入速率方程进行理论模拟,证明输出功率和耦合效率之间的必然联系,结果显示同相位超模输出功率随着耦合效率的增大而增大,得到单模输出的最大光-光转换效率为63.7%。A multi-core fiber laser with single-mode output is reported, which is mode selected by the proposed mechanism based on single-mode fiber. Using single-mode fiber combined with a total reflection mirror as mode selection element, the in-phase supermode always has much higher coupling coefficient than that of the other higher- order supermodes. As a result, high brightness single in-phase supermode output is obtained while higher-order supermodes are suppressed. The coupling coefficient can be optimized by choosing proper single-mode fiber core radius and adjusting the gap distance between multi-core fiber and single-mode fiber. The relationship between coupling coefficient and single-mode output power is investigated. The simulation results got from rate equation show that the output power increases with coupling coefficient, and the maximum optical-optical conversion efficiency is calculated to be 63.7 %.

关 键 词：激光器 多芯光纤激光器 耦合效率 同相位超模 单模光纤 

分 类 号：TN248.1[电子电信—物理电子学]