窄谱被动锁模光纤激光中心波长高速调谐及其脉冲重建过程  

High-Speed Center Wavelength Tuning of Narrow-Spectrum Passively Mode-Locked Fiber Laser and Its Pulse Reconstruction Process

作　　者：朱喆 王麓屹 陈学文 林巍 杨洋[1,2] 张静 刘涛[1] 韦小明 杨中民[1,2,4,5,6] Zhu Zhe;Wang Luyi;Chen Xuewen;Lin Wei;Yang Yang;Zhang Jing;Liu Tao;Wei Xiaoming;Yang Zhongmin(School of Physics and Optoelectronics,South China University of Technology,Guangzhou 510640,Guangdong,China;State Key Laboratory of Luminescent Materials and Devices,South China University of Technology,Guangzhou 510640,Guangdong,China;School of International Education,Zhejiang Institute of Mechanical and Electrical Engineering,Hangzhou 310051,Zhejiang,China;Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices,South China University of Technology,Guangzhou 510640,Guangdong,China;Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,South China University of Technology,Guangzhou 510640,Guangdong,China;Research Institute of Future Technology,South China Normal University,Guangzhou 510006,Guangdong,China)

机构地区：[1]华南理工大学物理与光电学院,广东广州510640 [2]华南理工大学发光材料与器件国家重点实验室,广东广州510640 [3]浙江机电职业技术学院国际教育学院,浙江杭州310051 [4]华南理工大学广东省特种光纤材料与器件工程技术研究开发中心,广东广州510640 [5]华南理工大学广东省光纤激光材料及应用技术重点实验室,广东广州510640 [6]华南师范大学未来技术研究院,广东广州510006

出　　处：《光学学报》2024年第5期120-127,共8页Acta Optica Sinica

基　　金：国家自然科学基金(62375087,12374304,62235014,61927816);广东省珠江人才引进创新团队项目(2021ZT09Z109);广东省自然科学基金(2021B1515020074);广东省科技计划项目(2020B1212060002);中德交流项目(M-0296)。

摘　　要：报道基于快速声光滤波技术的窄谱被动锁模掺镱光纤激光中心波长快速调谐研究。窄谱锁模光纤激光器系统的输出功率可达200 mW,脉冲宽度为5.87 ps,重复频率为40.874 MHz,光谱带宽为0.15 nm。通过编程声光可调谐滤波器的射频信号,可以获得中心波长在1016~1042 nm范围内可调谐的稳定锁模脉冲。为了掌握腔内滤波时激光脉冲的重建过程,利用色散傅里叶变换技术观测波长调谐时激光脉冲的实时重建过程,并确定激光器的最高中心波长调谐频率约为5 kHz。Objective After decades of development,mode-locked fiber lasers can provide laser pulses with high coherence,high pulse energy,and controllable pulse width and repetition rate.Mode-locked pulsed lasers can play a key role in some specific research areas.For instance,in biomedicine,lasers are used as light sources to perform coherent tomography imaging and the information of the samples under test can be collected and recorded at the same time.However,in the process,the signals of some substances with similar excitation wavelengths can interfere with each other,thus affecting the measurement results.Therefore,the development of wavelength tunable mode-locked lasers to improve spectral resolution is of great significance to the research in this field.We study the rapid tuning of the center wavelength of a narrow-spectrum passive mode-locked ytterbium fiber laser based on fast acousto-optic filtering technology.Combining fast acousto-optic filtering technology,we obtain a stable mode-locked pulse with a center wavelength tuning function.To investigate the reconstruction process of laser pulses during intracavity filtering and confirm the reliability of this technology,we record the real-time reconstruction process of laser pulses during the tuning of the center wavelength.We hope that our research can provide a reliable solution for applications requiring high spectral resolution.Methods The laser consists of a laser cavity and a two-stage amplifier.The fiber cavity consists of a semiconductor saturable absorption mirror(SESAM),a wavelength division multiplexer(WDM),a 40 cm long ytterbium-doped fiber(CorActive Yb406,YDF),a 90∶10 fiber coupler(90∶10 OC),a collimator,and aλ/2 waveplate(HWP).It is composed of acousto-optic tunable filter,reflect mirror,and piezoelectric ceramic transducer(PZT).The piezoelectric ceramic is combined with a mirror to lock and stabilize the output laser repetition rate by adjusting the length of the phase-locked loop feedback.The phase-locked loop is composed of a photodetector(PD),an

关 键 词：激光器 光纤激光器 波长可调谐 色散傅里叶变换 脉冲重建 

分 类 号：TN248[电子电信—物理电子学]