自动NPE锁模飞秒激光频率梳研究  

Investigation of Automatically NPE Mode-locking Femtosecond Laser Frequency Comb

作　　者：张文玺 杨旭红[1] 杨瑞强[1] 陈大勇[1] 肖玉华[1] 缪培贤 王骥[1] 刘志栋[1] 范栋 代虎[1] ZHANG Wenxi;YANG Xuhong;YANG Ruiqiang;CHEN Dayong;XIAO Yuhua;MIU Peixian;WANG Ji;LIU Zhidong;FAN Dong;DAI Hu(Science and Technology on Vacuum Technology and Physics Laboratory,Lanzhou Institute of Physics,Lanzhou 730000,China)

机构地区：[1]兰州空间技术物理研究所真空技术与物理重点实验室,兰州730000

出　　处：《真空与低温》2023年第6期570-576,共7页Vacuum and Cryogenics

基　　金：国家自然科学基金(62275114);重点实验室基金(HTKJ2021KL510001);技术基础科研项目(JSJL2022203B002)。

摘　　要：基于非线性偏振演化(NPE)锁模技术的光纤光梳具有脉冲宽度窄、光谱覆盖广、重复频率高、相位噪声低等诸多优点,然而,由于锁模稳定性不好,该技术逐渐在工程应用中被非线性放大环形镜(NALM)和半导体可饱和吸收镜(SESAM)锁模技术取代。为了扩展NPE光纤光梳的工程应用范围,研制了具有自动锁模功能的NPE掺铒光纤光梳,采用电控偏振控制器和自动锁模电路实现光纤激光器的自动锁定,锁模脉冲宽度90 fs,重复频率101.5 MHz。采用共线式f-2f自参考技术测得40 dB的载波包络相移频率fceo信号,并采用上混频与64分频相结合的方式将fceo锁定至20 MHz,锁定精度1.5 mHz。通过锁定40次谐波的方法,利用自研的重复频率调节机构实现重复频率frep锁定,锁定后的频率精度为199μHz。Fiber optical combs based on nonlinear polarization evolution(NPE)mode-locking technology have many advantages such as narrow pulse width,wide spectral range,high repetition rate and low phase noise,but due to the problem of mode-locking stability,they are gradually replaced by nonlinear amplifying loop mirror(NALM)and semiconductor saturable absorber mirror mode-locking technology in engineering applications.In order to expand the engineering application region of NPE fiber optical comb,an NPE erbium-doped fiber optical comb with automatically mode-locking function was developed and the automatic locking of fiber laser oscillator was realized by electronically controlled polarization controller driven by automatic search circuit for mode locking,with a mode-locked pulse width of 90 fs and a repetition rate of 101.5 MHz.The 40 dB carrier-envelope offset frequency fceo signal was measured by collinear f-2f self-reference technology,and the fceo was locked to 20 MHz by combining up-mixing and divide-by-64 with a locking accuracy of 1.5 mHz.By locking the 40th higher harmonic,the repetition rate frep lock is realized by the self-developed repetition rate feedback mechanism,and the frequency accuracy after locking is 199μHz.

关 键 词：光学频率梳 飞秒激光 自动锁模 锁相环 电控偏振控制器 

分 类 号：TN248[电子电信—物理电子学] TM935[电气工程—电力电子与电力传动]