面向Li原子D1线频率测量应用的掺铒飞秒光纤光梳系统  

Er:fiber Femtosecond Optical Frequency Comb Aimed at Measurement of Frequency of D1 Line in Li Atoms

作　　者：饶冰洁 张颜艳[1,2] 闫露露 武跃龙[3] 张攀 樊松涛 郭文阁[1] 张晓斐[1,2] 张首刚 姜海峰[1,2] RAO Bing-jie;ZHANG Yan-yan;YAN Lu-lu;WU Yue-long;ZHANG Pan;FAN Song-tao;GUO Wen-ge;ZHANG Xiao-fei;ZHANG Shou-gang;JIANG Hai-feng(Key Laboratory of Time and Frequency Primary Standards,National Time Service Center, Chinese Academy of Sciences,Xi’an 710600,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Precision Spectroscopy,East China Normal University,Shanghai 200062,China)

机构地区：[1]中国科学院国家授时中心时间频率基准重点实验室,西安710600 [2]中国科学院大学天文与空间科学学院,北京100049 [3]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

出　　处：《光子学报》2019年第1期115-120,共6页Acta Photonica Sinica

基　　金：国家自然科学基金(No.91536217)~~

摘　　要：报道了自主研制的面向Li原子D1线频率测量应用的掺铒飞秒光纤光学频率梳,包括飞秒激光源,频率探测及控制单元,光谱展宽及拍频单元.光纤光梳系统中飞秒激光光源是一套基于非线性偏振旋转锁模机制的掺铒飞秒光纤激光器,重复频率为196.5MHz,中心波长为1 572nm.利用f-2f法探测载波包络相移频率,获得信噪比约为40dB的信号(分辨率带宽300kHz).改变飞秒激光光源泵浦控制载波包络相移频率、频率稳定度是3.74×10-18/τ1/2;通过电光晶体和压电陶瓷改变飞秒激光光源腔长来控制重复频率frep、频率稳定度是1.75×10-13/τ1/2.利用高非线性光纤和倍频晶体将光纤光梳直接输出光谱由1 520～1 607nm扩展到671nm,获得了单模功率为208nW的光信号.与671nm单频激光拍频产生约为60dB(分辨率带宽1Hz)信号,满足Li原子D1线频率测量实验的需求.A home-made Er:fiber optical frequency comb aimed at measurement of frequency of D1line in Li atoms was demonstrated.The system includes Femtosecond laser,f rep and f ceo detection and control,Spectral broaden and Beat unit.Femtosecond laser is a home-made nonlinear-polarization-rotation mode-locked laser,oscillating at around1572nm with a repetition rate of196.5MHz.The f ceo detection is accomplished by using the f-2f beating method,the signal-to-noise ratio of f ceo about40dB with300kHz.f ceo controlled by changing the pump current and its in-loop frequency instability,evaluated by the Allan deviation,is approximately3.74×10^-18/τ^1/2;f rep controlled by changing the cavity length of femtosecond laser,its in-loop frequency instability is approximately1.75×10^-13/τ^1/2.Optical spectrum is broadened and multipliered from infrared1520-1607nm to671nm by using highly nonlinear fiber and MgO:Periodically poled lithium niobate.Finally,obtaining the beat signal between sigle-frequency laser and optical comb about60dB with1Hz.

关 键 词：光学频率梳 锁模激光器 掺铒光纤 光谱扩展 频率测量 

分 类 号：TN249[电子电信—物理电子学]