波长可调谐和异步双波长锁模掺铒光纤激光器  

Wavelength-Tunable and Asynchronous Dual-Wavelength Mode-Locked Er-Doped Fiber Laser

作　　者：谢芷璇 邓樑旭 倪溢棉 曾浚壕 李艳 Xie Zhixuan;Deng Liangxu;Ni Yimian;Zeng Junhao;Li Yan(School of Optoelectronic Engineering,Guangdong Polytechnic Normal University,Guangzhou 510665,Guangdong,China)

机构地区：[1]广东技术师范大学光电工程学院,广东广州510665

出　　处：《光学学报》2023年第4期112-117,共6页Acta Optica Sinica

基　　金：国家自然科学基金(62105072);广州市科技计划(202102020571);广东大学生科技创新培育专项资金资助项目(pdjh2020b0343);省级大学生创新创业训练计划(S202210588021);广东技术师范大学人才引进科研启动项目(2021SDKYA169)。

摘　　要：利用激光诱导沉积法制备了碳纳米管可饱和吸收体,结合偏振控制器和保偏光纤产生的双折射滤波效应,在同一个环形掺铒光纤激光器中实现了波长可调谐,并获得了两种异步双波长锁模状态。通过调节泵浦功率和偏振控制器,获得了中心波长在1550 nm附近稳定可自启的锁模,波长可调谐范围为8.88 nm。同时,获得了两种异步双波长锁模状态,重复频率均约为49.9 MHz,脉冲重复频率差分别为1395 Hz和1089 Hz。Objective Wavelength-tunable and multi-wavelength ultrafast lasers,which can generate pulse trains at different center wavelengths,are applied widely in optical communication,sensing,and spectroscopy.In relevant research,different wavelength selection components,such as Mach-Zehnder interferometer filter,fiber Bragg grating and tunable filter,or birefringence-induced filtering(BRIF)effect are utilized for optical filtering.Compared with the former,the latter does not need to add expensive filter devices in the cavity.Additionally,the latter can also flexibly control the spectral spacing by adjusting the fiber length.Carbon nanotubes(CNTs),which can exhibit broad operation bandwidth at different spectral windows,are hotspots for multi-wavelength pulse generation.In current wavelength-tunable or multi-wavelength passive mode-locking fiber lasers based on CNT saturable absorber(SA),the SA is usually made by CNT/polyimide composite film,which is conducive to the simple and rapid construction of fiber lasers.However,compared with the laser-induced deposition method,this method requires close cooperation with material preparation,without benefiting the parameter controlling.Therefore,a wavelength-tunable and asynchronous dual-wavelength mode-locked Er-doped fiber laser based on CNT-SA obtained by the laser-induced deposition method is proposed.The results provide an approach to realize the wavelength-tunable and multi-wavelength mode-locked fiber laser simultaneously.Methods The CNT-SA is obtained by the laser-induced deposition method.Firstly,CNTs are soaked in the alcohol solution with surfactant added.Secondly,the solution is transferred into a centrifugal tube after stirring.Thirdly,CNTs are deposited onto the core of a single-mode fiber by the optical power of 5 mW for~10 min.Finally,the CNT-SA is assembled by fixing two single-mode fibers with an FC/APC ferrule.The wavelength-tunable and asynchronous dualwavelength mode-locked fiber laser is passively mode-locked by the CNT-SA.A length of~0.5 m Er-doped fiber is

关 键 词：激光器 锁模 光纤激光器 碳纳米管 双波长 波长可调谐 

分 类 号：TN248[电子电信—物理电子学]