掺镱被动锁模光纤激光器的孤子碰撞研究  

Soliton Collisions in Ytterbium⁃Doped Passively Mode⁃Locked Fiber Laser

作　　者：李哲哲 何江勇 李晋 王世海 刘聪聪 宁钰 王攀 刘艳格[1] 王志[1] Li Zhezhe;He Jiangyong;Li Jin;Wang Shihai;Liu Congcong;Ning Yu;Wang Pan;Liu Yange;Wang Zhi(Tianjin Key Laboratory of Micro-Scale Optical Information Science and Technology,Institute of Modern Optics,College of Electronic Information and Optical Engineering,Nankai University,Tianjin 300350,China)

机构地区：[1]南开大学电子信息与光学工程学院现代光学研究所天津市微尺度光学信息技术科学重点实验室,天津300350

出　　处：《中国激光》2024年第18期39-46,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金(12274238,62205159,61835006);京津冀基础研究合作项目(21JCZXJC00010)。

摘　　要：报道了一种基于非线性偏振旋转技术的被动锁模掺镱光纤激光器,利用时间拉伸色散傅里叶变换实时探测技术对孤子瞬态的演化过程进行了分析,展示了双波长孤子碰撞过程,对孤子碰撞过程进行了研究。探索了存在拉曼效应时的新型孤子碰撞的瞬态演化过程,并分析了拉曼效应对孤子碰撞产生的影响,展示了碰撞过程的不稳定性。研究结果有助于推动非线性动力学过程的研究。Objective Passively mode-locked fiber lasers,which are important for the development of fiber lasers,generate ultrashort pulses with wide spectral bandwidths and high peak power levels.They offer significant research value and are widely used in fields such as biosensing,communication,medicine,and military.The generation of dissipative solitons in these lasers requires a delicate balance among dispersion and nonlinear effects,gain and loss,spectral filtering effects of the gain medium,and saturable absorbers,thus rendering them an excellent platform for investigating nonlinear effects and soliton dynamics.Stimulated Raman scattering(SRS),which is a common nonlinear effect,has garnered widespread attention owing to its ability to significantly extend the wavelength range of ultrashort pulses.The development of time-stretch dispersive Fourier transform(DFT)techniques has enabled more dynamic soliton phenomena to be identified.Using DFT techniques,this study demonstrates double-soliton collisions in dissipative systems,as well as soliton collisions under SRS effects.The effect of SRS on the collision dynamics of solitons is demonstrated,thus expanding the study of nonlinear dynamic processes in soliton evolution dynamics.Methods In our experiment,we construct a ytterbium-doped passively mode-locked fiber laser with an entire laser cavity comprising positive-dispersion elements.We utilize a 50-cm-long ytterbium-doped fiber as the gain medium and exploit the birefringence filtering effect of the fiber as a filter.To provide a sufficient filtering bandwidth,we employ a 30-m-long single-mode fiber.A polarization-dependent isolator(PD-ISO)ensures the unidirectional transmission of pulses within the cavity and operates in conjunction with polarization controllers PC1 and PC2 to achieve nonlinear polarization locking.The cavity length is 40.5 m,with a net dispersion of approximately 0.99 ps2 and a repetition rate of 4.6114 MHz.We simultaneously measure the spectral,temporal,and real-time spectral characteristics using an o

关 键 词：光纤激光器 孤子碰撞 受激拉曼散射 时间拉伸色散傅里叶变换 

分 类 号：O436[机械工程—光学工程]