新型高掺Tm^(3+)石英光纤制备及2.0μm激光性能研究  

Preparation of Highly Tm^(3+)-Doped Silica Fibers and Study of 2.0μm Laser Performance

作　　者：沈骁[1] 杨广利 王亚飞 陈应刚 于春雷[2,3] 韦玮 胡丽丽[2,3] Shen Xiao;Yang Guangli;Wang Yafei;Chen Yinggang;Yu Chunlei;Wei Wei;Hu Lili(College of Electronic and Optical Engineering&College of Flexible Electronics(Future Technology),Nanjing University of Posts and Telecommunications,Nanjing 210023,Jiangsu,China;Laboratory of High Power Laser Components,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;School of Physics and Optoelectronic Engineering,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,Zhejiang,China)

机构地区：[1]南京邮电大学电子与光学工程学院、柔性电子(未来技术)学院,江苏南京210023 [2]中国科学院上海光学精密机械研究所高功率激光单元技术实验室,上海201800 [3]国科大杭州高等研究院物理与光电工程学院,浙江杭州310024

出　　处：《光学学报》2023年第4期104-111,共8页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(62075099,62074082);企业横向课题(2021外305,2021外398)。

摘　　要：稀土掺杂石英光纤具有物化性能稳定、机械强度高、易于系统集成等优点,是目前光纤激光器最核心的增益介质,但其稀土掺杂浓度一般较低(<2%)。利用溶胶凝胶法和高温烧结工艺制备了Tm^(3+)掺杂浓度为8.29×10^(20) cm^(-3)的高硅氧玻璃,并表征了其光谱性能。采用溶胶镀膜和二次熔融拉锥方法制备了芯径约为4μm、外径为125μm的石英光纤,其可与商用无源光纤进行熔接。利用全光纤化线性腔结构,以制备的不同长度掺Tm^(3+)石英光纤作为增益介质,均可实现1947 nm激光输出,光信噪比约为70 dB;当光纤长度为4.6 cm时,斜率效率高达14.1%;同时搭建了掺铥光纤放大器,测得光纤小信号净增益系数为0.48 dB/cm。研究结果表明,该新型光纤制备方法可为高浓度掺铥石英光纤提供新途径,有望推动其在2.0μm单频及高重频锁模光纤激光器中的应用。Objective The 2.0μm-band single-frequency laser has the advantages of narrow linewidth,low noise,and good monochromaticity,which is widely used in many fields,such as precision measurement,spaceborne lidar,and highresolution spectroscopy.Compared with multi-component glass fibers,the rare-earth-doped silica fiber is the core gain medium of fiber lasers,which boasts stable physical and chemical properties,high mechanical strength,and easy system integration.However,it is difficult to achieve the high-concentration doping of rare earth ions by traditional fabrication processes.There is still a gap in the doping concentration between the reported multi-component glass and the silica glass prepared by mature modified chemical vapor deposition(MCVD)combined with the liquid-phase doping process.Used in the short gain fiber for single-frequency lasers based on a distributed Bragg reflection(DBR)structure,the highly Tm^(3+)-doped technique ensures that the fiber has higher effective absorption to the pump source and a lower laser output threshold,which is more conducive to improving the laser performance of the system.For the high gain medium of 2.0μm-band single-frequency lasers,how to further improve the concentration of Tm^(3+)in silica glass becomes the focus of this paper.Methods We use Tetracthoxysilane(TEOS)as the silicon source,Al2O3 as the network-forming body,and La2O3 as the dispersant of silica glass to prepare highly Tm^(3+)-doped silica sol.Firstly,the high silica glass with the Tm^(3+)doping concentration of 8.29×10^(20) cm^(−3) is prepared by the sol-gel method and high-temperature sintering technology,which has good optical quality,and its spectral properties are characterized.Secondly,the sol-gel coating and melting taper drawing methods are combined innovatively to coat the inner wall of the silica capillary tube.After the film is heat-treated and tapered step by step,the silica fiber with a core diameter of about 4μm and a cladding diameter of 125μm is prepared,and the doping concentration of T

关 键 词：激光器 光纤激光器 Tm^(3+)高掺石英光纤 溶胶凝胶法 熔融拉锥 

分 类 号：TN244[电子电信—物理电子学]