57 W 2.05μm单横模掺铥光纤激光MOPA  

57 W 2.05μm Single⁃Transverse⁃Mode Thulium⁃Doped Fiber Laser MOPA

作　　者：罗学文 张露[1,2] 付士杰 盛泉[1,2] 张钧翔[1,2] 史伟 姚建铨[1,2] Luo Xuewen;Zhang Lu;Fu Shijie;Sheng Quan;Zhang Junxiang;Shi Wei;Yao Jianquan(School of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Optoelectronics Information Technology,Ministry of Education,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学精密仪器与光电子工程学院,天津300072 [2]天津大学光电信息技术教育部重点实验室,天津300072

出　　处：《中国激光》2024年第8期32-37,共6页Chinese Journal of Lasers

基　　金：国家自然科学基金(62105240,62275190,62075159,61975146);山东省重点研发项目(2020CXGC010104,2021CXGC010202);天津大学自主创新基金(2023XPD-0020);光电信息技术教育重点实验室(天津大学)开放基金。

摘　　要：基于商用单模掺铥石英光纤设计了高功率2.05μm波段全光纤主振荡功率放大器(MOPA)。以自制环形腔掺铥光纤激光器为种子,利用级联滤波型波分复用器优化长波长种子的光信噪比,基于MOPA结构实现了高效的高功率输出。基于速率方程模型,理论分析了主放大级的注入信号光功率和增益光纤长度的优化关系;实验中在102.6 W的793 nm泵浦功率下获得了输出功率为57 W、光谱线宽为0.08 nm、光信噪比为58.8 dB的单横模激光输出,主放大级斜效率为52.6%。Objective Fiber lasers operating at the wavelength of 2.05μm(corresponding to the absorption peak of CO2 and the atmospheric transmission window)have attracted intense interest owing to their applications in coherent Doppler lidars,free space communication,etc.To date,the highest output power of a 2.05μm fiber laser has been scaled to the kilowatt level;it is obtained through a master oscillator power amplifier(MOPA)configuration combined with large mode area fiber.However,studying high-power single-mode fiber lasers is also important because they are cost-effective and more resistant to environmental disturbance.To date,the output power of single-mode thulium-doped fiber lasers has been limited to the multiwatt level owing to the diminishing emission cross section of thulium at 2.05μm and the rising background loss of silica fiber at wavelengths above 2μm.This work develops a rate equation model to determine the optimal incident signal power and thulium-doped fiber length,based on which a high power,singletransverse-mode 2.05μm fiber laser with a MOPA configuration is presented.Methods The schematic of the thulium-doped fiber laser MOPA,which contains an oscillator and two stages of amplifiers,is given in Fig.1.The seed laser is generated from a homemade ring-cavity thulium-doped fiber laser,after which a filter-type wavelength division multiplexer(FWDM)is inserted to improve the optical signal noise ratio(OSNR).In the amplifiers,the gain fiber is 10μm/130μm thulium-doped fiber and is forward-pumped by a 793 nm laser diode.In the power-amplifier,the gain fiber is coiled on a water-cooled plate for effective heat dissipation.A rate equation model is developed to determine the optimal incident signal power and thulium-doped fiber length for high-efficiency laser generation.Results and Discussions The simulation results are given in Fig.2;they indicate an optimal fiber length of 3.7 m and incident signal power of 4.4 W.In the experiment,the output power of the 2.05μm ring-cavity seed is 1.01 W and decreased

关 键 词：激光器 掺铥光纤激光器 2ΜM激光 单模光纤激光器 速率方程 

分 类 号：TN248[电子电信—物理电子学]