530 W全光纤结构连续掺铥光纤激光器  

530 W all-fiber continuous-wave Tm-doped fiber laser

作　　者：刘茵紫 邢颍滨 廖雷 王一礴 彭景刚 李海清 戴能利 李进延 Liu Yin-Zi;Xing Ying-Bing;Liao Lei;Wang Yi-Bo;Peng Jing-Gang;Li Hai-Qing;Dai Neng-Li;Li Jin-Yan(Wuhan National Laboratory for Optoelectronics,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]华中科技大学,武汉光电国家研究中心,武汉430074

出　　处：《物理学报》2020年第18期105-111,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:61735007);湖北省技术创新专项(批准号:2019AAA056)资助的课题.

摘　　要：采用改进的化学气相沉积工艺结合溶液掺杂法制备了掺Tm^3+石英光纤预制棒,并拉制成纤芯/包层尺寸约为25/400μm的双包层掺Tm^3+光纤,通过电子探针显微分析测得其中Tm2O3和Al2O3的浓度分别为2.6 wt%和1.01 wt%,在793 nm处测得的包层吸收为3 dB/m.基于上述大模场掺Tm^3+光纤,搭建了一个高功率全光纤主振荡功率放大结构的掺Tm^3+光纤激光器,窄线宽掺Tm^3+种子源经过一级放大后,最高输出功率达到530 W,对应的斜率效率为50%,输出激光的中心波长为1980.89 nm.实验中没有观察到明显的放大自发辐射和非线性效应,输出功率仅受限于抽运功率.该结果为目前国内2μm波段全光纤结构激光器实现的最高输出功率,验证了国产掺Tm^3+石英光纤在高功率系统中的可靠性.In the past decades,thulium-doped fiber lasers(TDFLs)operating in an eye-safe range have attracted considerable attention,for they have extensive applications such as LIDAR,free space communication,medical diagnostics and pumping source for holmium-doped fiber laser or optical parameter oscillator.In this paper,we report a high power all-fiberized TDFL based on main-oscillator power-amplifier(MOPA)configuration.The preform is fabricated by the modified chemical vapor deposition method combined with solution doping technique and drawn into a core/clad size of 25/400μm.The numerical aperture of the TDF is 0.1.The concentration of Tm2O3 and Al2O3 are 2.6 wt% and 1.01 wt%,respectively,measured by an electron probe micro-analyzer.The cladding absorption is 3 dB/m at 793 nm measured by cut-back method.The oscillator consists of 8 m 25/400 TDF mentioned above and a pair of fiber Bragg gratings.The oscillator yields maximum power of 91 W with pump power of 202 W and a 3 dB spectral bandwidth as narrow as 75 pm.In the amplifier stage,the bi-directional pumping scheme is employed.The narrow linewidth seed with output power of 57 W is scaled to 530 W through one-stage amplification,corresponding to a slope efficiency of 50%.The central wavelength of the Tm-doped MOPA is 1980.89 nm and the linewidth is broadened to 0.11 nm at 530 W.The measured M 2 factor at 100 W is less than 1.3.Neither obvious amplified spontaneous emission nor non-linear effect is observed,and the output power is only limited by pump power.To the best of our knowledge,this is the highest output power of TDF at present.

关 键 词：光纤制备 光纤激光器 高功率掺铥光纤放大器 

分 类 号：TN248[电子电信—物理电子学]