基于非线性环形镜锁模的全保偏光纤光梳系统  

All Polarization Maintaining Fiber-Based Optical Comb System with Nonlinear Loop Mirror Mode-Locking

作　　者：陆诗雨 郝强[1] 刘婷婷 陈飞[1] 任心仪 沈旭玲 闫明 曾和平[2,3] Lu Shiyu;Hao Qing;Liu Tingting;Chen Fei;Ren Xinyi;Shen Xuling;Yan Ming;Zeng Heping(School of Optical Electrical Information and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China;Infrared Photonics Laboratory,Jinan Institute of Quantum Technology,Jinan,Shandong 250101,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093 [2]华东师范大学精密光谱科学与技术国家重点实验室,上海200062 [3]济南量子技术研究院红外光子学实验室,山东济南250101

出　　处：《中国激光》2021年第21期12-20,共9页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB0407100)。

摘　　要：探究了一种基于非线性放大环形镜锁模的全保偏掺铒光纤光梳系统,重复频率(f_(r))为75.27 MHz,f_(r)与载波包络偏移频率(f_(0))的标准偏差为分别为358μHz和248 mHz。该系统通过温度反馈控制锁模振荡器局部环境、电压反馈控制压电陶瓷伸缩量、电流反馈控制泵浦源功率实现了对f_(r)和f_(0)的精确锁定,在10℃温度波动的外部环境中实现约100 h的稳定工作。最后,将该光梳应用于混合气体光谱检测实验,获得的乙炔吸收谱线与HITRAN数据库模拟结果一致,表明该光梳系统可初步用于光谱分析等室外应用。Objective Compared with the traditional laser,fiber laser has the advantages of simple structure,high stability,and small size,becoming the research focus of practical optical comb.The structure of fiber-based optical comb with nonlinear polarization rotation(NPR)mode-locking is simple,but the refractive index of non polarization-maintaining fiber is easily affected by vibration and temperature,and the long-term stability of mode-locked state and phaselocked state of the oscillator is poor.The optical frequency comb based on semiconductor saturable absorption mirror(SESAM)can improve the influence of environmental noise due to the fully polarization maintaining fiber structure and appropriate damping measures.However,SESAM has the risk of light-induced damage during long-term use.It has a relaxation time of several hundred femtoseconds to picoseconds,bringing additional phase noise and instability to the optical comb.Most of the reports about the long-term stable operation of the comb were obtained in the constant temperature laboratory.In this study,we report a compact optical frequency comb with all polarization maintaining fiber structure.The system had kept stable operation for a long time in the external environment of 10℃ temperature fluctuation,and the mixed gas detection experiment was completed.This paper provides a feasible method for realizing practical optical frequency comb.Methods In the study,a mode-locked fiber laser with nonlinear amplifying loop mirror(NALM)was used as the seed source of the optical comb,which was placed in a sealed cavity to achieve isolation from the external environment.Then,the optical power amplification,pulse width compression,and spectrum broadening were studied by using cascaded erbium-doped fiber amplifier,single-mode polarization-maintaining fiber(PMF),and highly nonlinear fiber(HNLF).The broadened spectrum was injected into the f-2 f self-referenced detector to detect the carrier envelope offset frequency(f_(0))signal.Then,by precision controlling the local temperat

关 键 词：激光器 光学频率梳 载波包络偏移频率 频率锁定 

分 类 号：TN249[电子电信—物理电子学]