基于环形器的线形腔可控掺镱自扫光纤激光器  

Linear-Cavity-Controlled Self-Sweeping Ytterbium-Doped Fiber Laser Based on Circulator

作　　者：左振忠 王凯乐 黄先明 陈浩伟[1,2,3] 陆宝乐[1,2,3] 白晋涛[1,2,3] Zuo Zhenzhong;Wang Kaile;Huang Xianming;Chen Haowei;Lu Baole;Bai Jintao(State Key Laboratory of Photon-Techmology in Western China Energy,Northwest University,Xi'an 710127,Shaanai,China;Shaanai Engineering Technology Research Center for Solid State Lasers and Application,North west University,Xi'an 710127,Shaanai,China;Provincial Key Laboratory of Photo-Electronic Technology,Institute of Photonics and Photon-Technology,North west University,Xi'an 710127,Shaanai,China)

机构地区：[1]西北大学省部共建西部能源光子技术国家重点实验室,陕西西安710127 [2]西北大学陕西省全固态激光及应用工程技术研究中心,陕西西安710127 [3]西北大学光子学与光子技术研究所陕西省光电子技术重点实验室,陕西西安710127

出　　处：《中国激光》2022年第23期13-19,共7页Chinese Journal of Lasers

基　　金：陕西省重点研发计划国际科技合作项目(2020KW-018)。

摘　　要：展示了一种基于环形器的线形腔可控掺镱自扫光纤激光器,腔两端的反射光在掺镱光纤内形成驻波场,产生空间烧孔效应,进而诱导形成动态光栅,产生自扫效应。当泵浦功率达到22.5 mW时,获得了正向自扫效应,当泵浦功率为48.8 mW时,获得的最大自扫范围约为6 nm(1065.4217~1071.4225 nm)。在整个实验过程中,获得的扫描速度为0.56~8.83 nm/s,平均脉冲重复频率为12.08~115.20 kHz。当泵浦功率为161.3 mW时,获得的最大光学信噪比为53.18 dB。实验中,在环形器内引入一个机械式可调谐光衰减器,通过改变腔内损耗,简单有效地对自扫范围和自扫速度等自扫特性进行了调控,并将自扫范围扩大为10.83 nm。Objective Due to the rapid development of fiber laser technology,tunable fiber lasers have become an important d evelopment direction of fiber lasers.Their flexible wavelength tuning characteristics are highly valuable in optical communication,optical sensing,and spectral synthesis.However,to achieve a periodic and stable wavelength tuning operation,tunable fiber lasers often use electrically driven piezoelectric ceramics,heaters,fiber gratings or tunable sweeping filters,and other sweeping devices,which results in a complex structure and reduced output performance of the fiber laser,significantly limiting its development and practical applications.In recent years,a new type of tunable fiber laser based on the self-sweeping effect has gained the interest of researchers.Compared with general tunable fiber lasers,the self-sweeping fiber laser can achieve spontaneous,stable,and periodic wavelength tunability without using complex tuning elements or electrically driven drives.The phenomenon of the self-sweeping effect was first reported in 1962 when a periodic shift of wavelength was observed in a ruby laser.Half a century later,based on the excellent waveguide medium of optical fiber,researchers in Russia realized the first ytterbium-doped(Yb-doped)self-sweeping fiber laser.Thereafter,based on the typical Fabry--Perot linear cavity s tructure,researchers observed the self-scanning effect in different bands using different gain media.These bands have greatly facilitated the application of self-sweeping fiber lasers in various research fields and self-sweeping fiber lasers have become one of the research hotspots.In this study,we design a linear-cavity--controlled Yb-doped self-sweeping fiber l aser based on a circulator,which is easy to implement,inexpensive,and flexible in controlling the self-sweeping characteristics,such as self-sweeping range and self-sweeping rate,potentially expanding the practical applications of selfsweeping fiber lasers.Methods In this study,a Yb-doped self-sweeping fiber laser based on a ci

关 键 词：激光器 光纤激光器 自扫效应 光谱特性 微秒脉冲 

分 类 号：O436[机械工程—光学工程]