高功率线偏振掺镱光纤激光器性能调控技术研究进展  

Performance Control Techniques of High-Power Linearly Polarized Yb-Doped Fiber Lasers

作　　者：闫平[1,2] 吴与伦 李丹[1,2] 王祎[3] 肖起榕[1,2] 巩马理[1,2] Yan Ping;Wu Yulun;Li Dan;Wang Yi;Xiao Qirong;Gong Mali(Key Laboratory of Photonics Control Technology of the Ministry of Education,Department of Precision Instrument,Tsinghua University,Beijing 100084,China;State Key Laboratory of Precision Measurement Technology and Instruments,Department of Precision Instrument,Tsinghua University,Beijing 100084,China;Weiyang College,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学精密仪器系光子测控技术教育部重点实验室,北京100084 [2]清华大学精密仪器系精密测试技术及仪器国家重点实验室,北京100084 [3]清华大学未央书院,北京100084

出　　处：《光学学报》2023年第15期270-285,共16页Acta Optica Sinica

基　　金：国家自然科学基金(61875103,62122040,62075113)。

摘　　要：线偏振光纤激光器相比于随机偏振光纤激光器,在相干探测、相干合成、偏振合成及非线性频率变换等方面有广泛的应用,因此近年来受到特别关注。本文先对近几年国内外的线偏振光纤激光器研究成果进行简要总结,再针对该类激光器的偏振控制技术、光谱控制技术及光束质量控制技术进行归纳和评述。Significance Compared with conventional optical fiber lasers,linearly polarized fiber lasers are widely used in coherent detection,coherent combination,polarization combination,and nonlinear frequency transformation.Therefore,linearly polarized fiber lasers have received special attention in recent years.Although the power of linearly polarized fiber lasers has been significantly improved in recent years,its power level is still far from that of randomly polarized fiber lasers.Because of the polarization characteristics of the linearly polarized fiber laser,its nonlinear effect and thermal effect are different from those of conventional lasers,and polarization deterioration needs to be considered additionally.Therefore,the spectrum,polarization,and beam quality of the output laser need to be strictly controlled in the process of boosting power.In recent years,the power boosting process of linearly polarized fiber lasers mainly includes two types of system structures.One based on an oscillator stage and amplifier stage is called FOL-MOPA,and the other based on a phasemodulated single-frequency laser and amplifier stage is called SFL-MOPA.The output power of these two configurations has reached more than 3 kW and even more than 4 kW for SFL-MOPA.In the process of power breakthrough,a series of problems that will lead to the deterioration of output parameters should be dealt with.In recent years,various research teams have accumulated many effective methods.Progress Firstly,in terms of spectral control and spectral linewidth control,stimulated Brillouin scattering(SBS)suppression and stimulated Raman scattering(SRS)suppression are mainly considered in linearly polarized fiber lasers.According to the difference in system structures,the nonlinear problems in SFL-MOPA and FOL-MOPA structures are different.Because there is no phase control in the FOL-MOPA structure,the spectral linewidth in the amplifier stage will be naturally broadened by self-phase modulation(SPM),cross-phase modulation(XPM),and four-wave mixing(FWM)

关 键 词：线偏振光纤激光器 偏振消光比 掺镱光纤 光谱控制 光束质量 

分 类 号：TN248.1[电子电信—物理电子学]