基于非线性管理的类噪声掺铒锁模光纤激光器  

Noise-like Mode-locked Er:fiber Laser Based on Nonlinearity Management

作　　者：闫丽 林启蒙[1,2,3] 宋园起 贾谞卓 陶家宁 李杨阳 宋鹏葉 江曼(指导) YAN Li;LIN Qimeng;SONG Yuanqi;JIA Xuzhuo;TAO Jianing;LI Yangyang;SONG Pengye;JIANG Man(Institute of Photonics and Photon-technology,Northwest University,Xi'an 710127,China;Shaanxi Provincial Key Laboratory of Optoelectronic Technology,Xi'an 710127,China;State Key Laboratory of Energy Photonics technology in Western China,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,西安710127 [2]西北大学,陕西省光电子技术重点实验室,西安710127 [3]西北大学省部共建西部能源光子技术国家重点实验室,西安710127

出　　处：《光子学报》2022年第5期349-356,共8页Acta Photonica Sinica

基　　金：国家自然科学基金(No.11804276);陕西省自然科学基金(Nos.2019JQ-524,2020JQ-434)。

摘　　要：报道了一种基于非线性光纤的宽光谱类噪声锁模掺铒光纤激光器。在非线性偏振旋转锁模掺铒光纤激光谐振腔内引入色散补偿光纤和高非线性光纤,实现腔内色散和非线性管理,最终获得稳定的锁模脉冲输出。当在谐振腔内引入6 cm高非线性光纤时,可以获得中心波长为1534 nm,脉冲宽度为1.9 ps,重复频率为20.1 MHz,40 dB光谱带宽约为100 nm的超短脉冲输出。在此基础上,将高非线性光纤长度增加至30 cm时,通过优化波片角度,观察到稳定的类噪声锁模脉冲输出,其输出光谱覆盖范围为1280~1850 nm,40 dB带宽为500 nm,尖峰脉冲宽度短至70.9 fs,基座脉冲宽度为26.6 ps,重复频率约19.7 MHz。同时在实验中发现随着泵浦功率的提高,类噪声脉冲的基座脉宽和尖峰脉宽的演化呈相反趋势,光谱覆盖范围更宽。该类噪声锁模光纤激光器的研究对低相干光谱干涉技术的发展具有重要意义。Passive mode-locked fiber lasers have potential applications in fiber optic communication,fiber optic sensing,optical frequency measurement,and aerospace due to their good beam quality,compactness,small size,low fabrication cost,tunability,and easy generation of ultrashort pulses.In recent decades,several types of mode-locked pulses can be generated using passive mode-locked fiber lasers,such as Gaussian pulses,self-similar pulses,soliton pulses,noise-like pulses,and so on.Among them,noise-like pulses is a special pulse generated by mode-locked lasers under certain conditions,which is widely used in low-coherence spectral interferometry,micromachining,nonlinear frequency conversion and supercontinuum spectrum generation due to its wide pulse width,high energy,and low time-domain coherence.In light of these applications,broadband noise-like pulse generation in erbium-doped fiber lasers has attracted considerable interest.The study of noise-like erbium-doped fiber lasers based on passive mode-locking technique has been reported extensively.Researchers have mostly used longer gain fibers or single-mode fibers to adjust intracavity dispersion and accumulate nonlinearity as a way to obtain the output of noise-like mode-locked pulses.So far,it has not been reported that using highly nonlinear fiber based on nonlinear polarization rotating mode-locking mechanism to manage the nonlinear in laser cavity to realize the mode-locked fiber laser with wide spectrum.In this work,we experimentally report the noise-like pulses generation in an anomalous dispersion erbium-doped fiber laser based on nonlinearity management technique.The erbium-doped mode-locked fiber laser adopt nonlinear polarization rotation technique.In the experiment,by introducing dispersion compensating fiber and highly nonlinear fiber into the nonlinear polarization rotation mode-locked erbium-doped fiber laser resonator,intracavity dispersion and non-linearity management is achieved,resulting in a stable mode-locked pulse output.When the intracavity highly

关 键 词：宽光谱 高非线性光纤 色散 类噪声脉冲 非线性偏振旋转锁模 

分 类 号：TN248[电子电信—物理电子学]