高功率涡旋拉曼光纤激光器  

High-power vortex Raman fiber laser

作　　者：李阳[1] 范晨晨 郝修路 马小雅 姚天甫 许将明 曾祥龙[4] 周朴[1] Li Yang;Fan Chenchen;Hao Xiulu;Ma Xiaoya;Yao Tianfu;Xu Jiangming;Zeng Xianglong;Zhou Pu(College of Advanced Interdisciplinary Studies,National University of Defense Technology,Changsha 410073,China;Nanhu Laser Laboratory,National University of Defense Technology,Changsha 410073,China;Hunan Provincial Key Laboratory of High Energy Laser Technology,Changsha 410073,China;Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China)

机构地区：[1]国防科技大学前沿交叉学科学院,湖南长沙410073 [2]国防科技大学南湖之光实验室,湖南长沙410073 [3]高能激光技术湖南省重点实验室,湖南长沙410073 [4]上海大学特种光纤与光接入网重点实验室特种光纤与先进通信国际合作联合实验室,上海200444

出　　处：《红外与激光工程》2023年第6期257-262,共6页Infrared and Laser Engineering

基　　金：国家自然科学基金(12174445,62061136013)。

摘　　要：近年来,携带轨道角动量的涡旋光束在激光加工、光学微粒操纵、超分辨成像、大容量光通信等领域应用广泛,目前已在稀土掺杂光纤激光器中得到了广泛研究。基于声致光纤光栅,实验搭建了全光纤结构拉曼光纤激光器,实现LP_(01)模与LP_(11)模的有效调控,并进一步通过偏振控制实现环形径向偏振光和拓扑荷数l=±1的涡旋光束输出,最高输出功率~70 W,中心波长为1134 nm。文中提出的激光器有利于拓宽涡旋光束输出波段,在多维光通信、光场和物质相互作用等领域具备较大研究价值和应用潜力。Objective In recent years,vortex beams carrying orbital angular momentum(OAM)have attracted much attention due to their important research value and application prospects in optical communication,particle acceleration,particle manipulation,super-resolution imaging,and other fields.At present,vortex optical field can be mainly divided into two types,one is generated by spatial devices,such as the spatial light modulator,and the other is generated in fiber.Fiber lasers possess the advantages of compact structure,convenient thermal management,and high efficiency,which is conducive to realize the output of high-power and high-stability vortex beam.With the rapid development of big data,cloud computing,Internet of Things,and other technologies,it is urgent to expand the information capacity of communication systems.Vortex beams can greatly improve the capacity of communication systems because of their infinite orthogonality.At present,the output vortex beams of fiber lasers are mainly concentrated in the emission bands of rare earth ions such as ytterbium-doped,erbium-doped and thulium-doped,and the combination of space division,mode division and wavelength division multiplexing technology urgently needs to expand the wavelength range of the vortex beam.For this purpose,an all-fiberized vortex Raman fiber laser(RFL)is designed.Methods At present,many devices can realize vortex beam output in a fiber laser.Among them,the acoustically-induced fiber grating(AIFG)has the advantages of simple structure,wide wavelength tuning range,fast response speed and low insertion loss.Combined with the AIFG and RFL,when the output wavelength is converted by Raman frequency shift,there is no need to redesign and replace the mode conversion device.The RFL is built(Fig.1).The laser resonator is composed of a pair of fiber Bragg gratings and gain fiber.The AIFG is fused after the cavity.To control the polarization state of the output mode,a three-loop polarization controller(PC)is connected after AIFG.And the transmission spectrum of the

关 键 词：拉曼光纤激光器 涡旋光束 声致光纤光栅 轨道角动量 

分 类 号：TN248[电子电信—物理电子学]