摘要
利用45°倾斜光纤光栅(45°-TFG)作为光纤型起偏器,搭建了一台高可靠性高稳定性的掺铒锁模光纤激光器,并以此为基础实现了重复频率f_(rep)和载波包络偏移频率f_(ceo)的精确锁定。当泵浦功率为228 mW时,基于45°-TFG的锁模激光振荡器可实现3 dB光谱带宽为60.4 nm、脉冲宽度为68 fs的超短脉冲输出,在12 h内功率的均方根稳定性达到0.033%,且在较大的泵浦范围内均能维持较好的展宽锁模状态。经过自主搭建的非线性脉冲放大、超连续谱产生以及f-2f自参考拍频干涉光路,获得了信噪比为32 dB的f_(ceo)信号。最后通过搭建基于锁相环的主动反馈控制电路,将f_(rep)和f_(ceo)信号溯源至一台GPS时频系统,最终测得f_(rep)和f_(ceo)信号归一化后在1 s门时间内频率稳定度为2.38×10^(-12)和6.41×10^(-16)。这是首次实现基于45°-TFG的光纤激光频率梳,表明了基于45°-TFG的锁模光纤激光器在实际应用中的潜力。
A highly reliable and stable erbium-doped mode-locked fiber laser was constructed using a 45°-tilted fiber grating(45°-TFG) as a fiber polarizer.Based on this,precise signal stabilization of the repetition frequency f_(rep) and carrierenvelope offset frequency f_(ceo) was achieved.When the pump power is 228 mW,the mode-locked laser oscillator based on a 45°-TFG can achieve an ultra-short pulse output of 3 dB with a spectral bandwidth of 60.4 nm and a pulse width of 68 fs.The root mean square stability of the power reaches 0.033% within 12 hours,and it can maintain a good stretched modelocked state over a large pump range.After self-built chirped pulse amplification,super-continuum spectrum generation,and f-2f self-reference beat interference optical path,f_(ceo) signal with a signal-to-noise ratio of 32 dB was obtained.Finally,by building an active feedback control circuit based on a phase-locked loop,the f_(rep) and f_(ceo) signals were traced back to a GPS time-frequency system,and the frequency instability of the f_(rep) and f_(ceo) signals was measured to be 2.38×10~(-12) and 6.41×10~(-16) within an average time of 1 second.This is the first implementation of a fiber laser frequency comb based on a 45°-TFG,indicating the potential of a 45°-TFG based mode-locked fiber laser in practical applications.
作者
黄梓楠
黄千千
田昊晨
闫志君
邹萌
孙敬华
顾澄琳
王开
徐子硕
李卫淅
戴礼龙
梁新栋
牟成博
Huang Zinan;Huang Qianqian;Tian Haochen;Yan Zhijun;Zou Meng;Sun Jinghua;Gu Chenglin;Wang Kai;Xu Zishuo;Li Weixi;Dai Lilong;Liang Xindong;Mou Chengbo(Key Laboratory of Specialty Fiber Optics and Optical Access Networks,Shanghai Institute for Advanced Communication and Data Science,Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication,Shanghai University,Shanghai 200444,China;National Institute of Metrology,China,Beijing 100029,China;National Engineering Laboratory for Next Generation Internet Access System,School of Optical and Electronic Information,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China;School of Electronic Engineering and Intelligentization,Dongguan University of Technology,Dongguan,523808,Guangdong,China;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;Key Laboratory of Gravitational Wave Precision Measurement of Zhejiang Province,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,Zhejiang,China)
出处
《激光与光电子学进展》
CSCD
北大核心
2024年第1期99-108,共10页
Laser & Optoelectronics Progress
基金
国家自然科学基金(62135007,61975107)
广东省基础与应用基础研究基金区域联合基金重点项目(2020B1515120041)
之江实验室开放课题(K2022MH0AB01)
中国科学院空间主动光电技术重点实验室开放课题(2021-ZDKF-01)。
关键词
锁模光纤激光器
光纤光栅
非线性偏振旋转
光纤激光频率梳
mode-locked fiber laser
fiber grating
nonlinear polarization rotation
optical frequency comb
