被动锁模超短脉冲光纤激光器研究进展(特邀)  

Research Progress of Passively Mode-locked Ultrashort Pulse Fiber Lasers(Invited)

作　　者：陆宝乐[1,2,3] 陈程 林启蒙[1,3] 张朝阳 郎嘉靖 白晋涛 LU Baole;CHEN Cheng;LIN Qimeng;ZHANG Zhaoyang;LANG Jiajing;BAI Jintao(Institute of Photonics&Photon-technology,State Key Laboratory of Energy Photon-technology in Western China,Northwest University,Xi′an 710127,China;International Collaborative Center on Photoelectric Technology and Nano Functional Materials Xi′an 710127,China;Shaanxi Engineering Technology Research Center for Solid State Lasers and Application,Shaanxi Provincial Key Laboratory of Photo-electronic Technology,Xi′an 710127,China)

机构地区：[1]西北大学光子学与光子技术研究所,省部共建西部能源光子技术国家重点实验室,西安710127 [2]国家级光电技术与纳米功能材料国际联合研究中心,西安710127 [3]陕西省全固态激光及应用工程技术研究中心,陕西省光电子技术重点实验室,西安710127

出　　处：《光子学报》2022年第10期48-86,共39页Acta Photonica Sinica

基　　金：国家重大科研仪器研制项目(No.51927804)。

摘　　要：超短脉冲光纤激光器是激光器领域的一个重要分支,由于输出脉冲峰值功率高、脉冲宽度窄,吸引了大量科研工作者的关注。被动锁模技术是产生超短脉冲的常用手段,通过平衡谐振腔内色散与非线性,增益与损耗之间的相互作用来实现超短脉冲输出。深入理解被动锁模机制能够进一步推动超快光源的研究走向成熟。随着输出性能的逐步提升,超短脉冲光纤激光器的适用场景越来越丰富,能在不同领域发挥更加重要的作用。本文综述了目前光纤激光器中常用的几类被动锁模技术,包括:非线性光纤环形镜、非线性偏转旋转、低维纳米材料可饱和吸收体、非线性多模干涉以及最近涌现的Mamyshev振荡器和时空锁模等,阐述了各自的原理以及技术优势,并介绍了其在超短脉冲光纤激光器研究方面的最新进展。Benefited from the compact design,short pulse duration,and high peak power,ultrashort fiber lasers are always a research hotspot all over the world,which are attractive for a diverse range of applications,including biomedicine,material micromachining,optical communications,and nonlinear optics.Compared with traditional solid-state lasers,optical fibers,as flexible waveguides,have the advantages of small size,alignment-free,high beam quality,compact structure,and low cost.There is no doubt that ultrashort pulse fiber lasers are one of the most active and cutting-edge research direction in the field of lasers at present.When a pulse is transmitted in optical fiber,the existing dispersion and nonlinear effects have a certain influence on the pulse evolution.Since the fiber core is in the order of micrometers,the increase in power density will inevitably produce various nonlinear phenomena.Ultrashort pulse lasers are an ideal platform for researchers to study nonlinear effects,but the accumulation of excessive nonlinear phase shift is not conducive to the generation of stable ultrashort pulses,so balancing the dispersion and nonlinearity in the resonator cavity,the interaction between gain and loss is the key to realize ultrashort pulse output.Mode locking technology is an effective method to generate ultrashort pulses.The phase relationship of each longitudinal mode in the laser resonator is fixed to form a periodic pulse sequence in a certain way.Saturable absorber is a component with certain loss,the intensity dependency characteristics of the saturable absorber on the input pulse can be used to produce a pulse in the cavity.Several important parameters of the saturable absorber include the response of the wavelength range,saturable intensity,relaxation time,and modulation depth.Therefore,selecting proper saturable absorber can realize selfstarting and stable mode-locked pulse output.To further understand the research and application of ultrashort pulse fiber lasers,in this paper,we analyze the passively mode lock

关 键 词：光纤激光器 超短脉冲 被动锁模 可饱和吸收体 

分 类 号：TN248[电子电信—物理电子学]