基于多模干涉效应的可调谐大模场光纤激光器  

Tunable Large-Mode-Area Fiber Lasers Based on Multimode Interference Effect

作　　者：潘玉寨[1] 刘晓莉[2] 苏晓慧[1] 黄雪骄[1] 

机构地区：[1]哈尔滨工业大学(威海)光电科学系,山东威海264209 [2]焦作大学机电工程学院,河南焦作454000

出　　处：《中国激光》2013年第4期12-16,共5页Chinese Journal of Lasers

基　　金：山东省自然科学基金(ZR2010FQ017);哈尔滨工业大学科研创新基金(HIT.NSRIF.2009146);威海市科技计划(2011DXGJ09)资助课题

摘　　要：研究了基于多模干涉效应的线形腔可调谐掺镱双包层光纤激光器。激光器主要由单模光纤-多模光纤-平面反射镜构成的多模干涉光纤反射器、大模场面积掺镱双包层光纤、宽带介质全反镜和3dB输出耦合器构成。通过移动反射镜改变多模干涉光纤反射器的峰值波长实现了光纤激光器的可调谐输出。利用974nm光纤输出半导体激光器作为抽运源,实验获得了从1038.82nm到1071.06nm的不同激光波长输出,可调谐范围近32nm,3dB带宽约为0.2nm,平均输出功率为430mW,激光器斜效率约为31%。A widely tunable linear-cavity double-cladding Ytterbium-doped fiber laser based on multimode interference （MMI） effect is reported. The laser cavity consists mainly of MMI fiber reflecting element, which is composed of single-mode fiber, multi-mode fiber and broadband metal reflecting mirror, double-cladding Ytterbium- doped large-mode-area （LMA） fiber, broadband dielectric total reflecting mirror and 3 dB output coupler. The wavelength tuning of fiber lasers is realized by moving the mirror in MMI fiber reflecting element, which is changing the reflection peak wavelength. A wavelength tuning range of about 32 nm ranging from 1038.82 nm to 1071.06 nm is experimentally demonstrated by utilizing the optical spectral analyzer, with the 3 dB linewidth of 0.2 nm and the signal-to-noise ratio of roughly 40 dB. The average output optical power of 430 mW is obtained with 1.5 W of the launched pump power at 974 nm, and the slope efficiency is about 31%.

关 键 词：激光器 可调谐双包层光纤激光器 多模干涉效应 大模场面积双包层光纤 

分 类 号：TN253[电子电信—物理电子学] TN248.1