混合锁模掺镱光纤激光器中的两种脉冲演化路径  

Two Pulse Evolution Routes in Hybrid Mode-locked Ytterbium-doped Fiber Laser

作　　者：严义[1,2] 吕辰悦 郎嘉靖 赵永森 祁媚 陆宝乐 白晋涛[1,2] YAN Yi;LV Chenyue;LANG Jiajing;ZHAO Yongsen;QI Mei;LU Baole;BAI Jintao(State Key Laboratory of Energy Photon-technology in Western,Institute of Photonics&Photon-technology,Northwest University,Xi′an 710127,China;Shaanxi Provincial Key Laboratory of Photo-electronic Technology,Shaanxi Engineering Technology Research Center for Solid State Lasers and Application,Xi′an 710127,China;School of Information Science and Technology,Northwest University,Xi′a n 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]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 [3]西北大学信息科学与技术学院,西安710127

出　　处：《光子学报》2025年第3期264-274,共11页Acta Photonica Sinica

基　　金：国家自然科学基金(No.62375220);陕西省重点科技创新团队项目(No.2023-CX-TD-06)。

摘　　要：提出并演示了一种基于非线性偏振旋转以及半导体可饱和吸收镜的混合锁模掺镱光纤激光器。其中半导体可饱和吸收镜提供可饱和吸收效应实现锁模,而非线性偏振旋转提供光谱滤波实现对脉冲的操控。通过调整偏振控制器可以改变光谱滤波,在同一激光腔中实现两种不同的脉冲演化路径。在正弦型光谱滤波较强时输出单波长至七波长可切换同步锁模脉冲,当正弦型光谱滤波较弱时产生单、双波长耗散孤子锁模脉冲。同时,数值模拟验证了两种脉冲的动态演化过程。该研究加深了光谱滤波对脉冲演化的影响,并为多脉冲动力学的研究提供了新思路。Passively mode-locked fiber lasers,featuring a compact structure,narrow pulse width,and rich nonlinear phenomena,provide an ideal platform for ultrafast laser research owing to their wide range of biomedicine,generation of terahertz radiation,investigation of attosecond dynamics,and communication.Following years of research,a variety of passively mode-locked techniques have been developed and successfully employed to generate ultrashort pulses,such as nonlinear polarization rotation,nonlinear multimode interference,nonlinear amplifying loop mirrors,Mamyshev oscillator,semiconductor saturable absorber mirror,and two-dimensional material.As a typical nonlinear system,the passive mode-locked fiber laser produces pulses that are subject to many factors,including gain,loss,dispersion,nonlinear effects,and spectral filtering.Examples of such phenomena include dissipative solitons or conventional solitons generated under normal or anomalous group velocity dispersion conditions,respectively,and dissipative soliton resonances arising from inverse saturable absorption effects.Similarly,spectral filters,which enable the manipulation of pulses by limiting spectral broadening and promoting intracavity dissipation,are of crucial importance in the context of mode-locked fiber lasers.The state of solitons can be controlled to evolve towards soliton molecules and pulse splitting by bandpass filters or fiber Bragg gratings.The utilization of Lyot filters or multimode interference filters facilitates the generation of sinusoidal spectral filtering within the cavity,which in turn enables the formation of h-shaped pulses,multi-wavelength pulses,and pulses with high repetition frequency.Nevertheless,the majority of the above reports pertain to a singular evolutionary route of pulse,which significantly restricts its applicability in many application scenarios.To move the pulses towards different evolutionary routes within the same laser configuration,we constructed a hybrid mode-locked ytterbiumdoped fiber laser based on NPR and SESAM.

关 键 词：光纤激光器 混合锁模 光谱滤波 多波长 同步、异步脉冲 

分 类 号：TN248[电子电信—物理电子学]