摘要
采用自适应双光梳光谱检测方法对乙炔(C_2H_2)气体在ν_1+ν_3吸收带部分的P支谱线进行测量,并通过与HITRAN相应数据库的对比,验证了该方法的准确性。从采样定理出发,分析了自适应主动补偿技术的工作机理,并讨论了其高阶信号和带宽的特性。使用非线性光纤对光梳进行200nm范围的超连续谱展宽,拓展了其宽谱特性。时域信号单次采样时长为600μs,光谱分辨率达1.09GHz,光谱更新频率为180Hz。自适应补偿技术有效解决了自然室温条件下梳齿快漂引起的光谱抖动问题。同时,光梳振荡源重复频率锁定后均方差抖动控制为7.01 MHz,锁定光梳振荡源的重复频率和反馈调节控制连续激光的中心频率,可有效抑制光梳梳齿的慢漂现象,使双光梳光谱测量系统的稳定运行时间由几分钟提升至半小时量级,增强了自适应双光梳系统的长期稳定性和实用性。
In this paper,partial P branch lines in the ν1＋ ν3 absorption band of the acetylene are measured by the adaptive dual-comb spectroscopy sampling technique.The validity of the method is verified by comparison of the measured results with the standard absorption lines in HITRAN database.The mechanism of adaptive sampling technique based on the sampling theorem is analyzed.High-order features and bandwidth characteristics of the adaptive sampling techniques are further discussed.In the experiment setup,200 nm super continuums are generated in nonlinear fiber,and then the wide spectra are extended.Partial absorption lines of the acetylene are retrieved from a 600μs pulse signal in time domain with 1.09 GHz spectral resolution at a refresh rate of 180 Hz.The fast instabilities between combs are well compensated by the adaptive sampling technique under a room temperature environment.Meanwhile,with a 7.01 MHz stabilization accuracy of repetition rates,we suppress slow drifts effectively by further stabilizing the repetition rates of combs and tuning the center frequency of continuous-wave lasers.In this way,the stable running time of the dual-comb adaptive sampling system is increased from only a few minutes to more than half an hour,and thus the long-term stability and practicability of adaptive dual-comb spectroscopy are enhanced.
作者
杨力
沈旭玲
杨康文
郝强
曾和平
Yang Li;Shen Xuling;Yang Kangwen;Hao Qiang;Zeng Heping(School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology Shanghai 200093, China;State Key Laboratory of Precision Spectroscopy Science and Technology, East China Normal University, Shanghai, 200062, China;State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, China)
出处
《光学学报》
EI
CAS
CSCD
北大核心
2018年第5期148-154,共7页
Acta Optica Sinica
基金
国家重大科学仪器设备开发专项(2012YQ150092)
国家自然科学基金(11704253
11434005
11504235)
中国博士后基金(2015M581634)
上海市青年科技英才"扬帆计划"(17YF1413100)
关键词
激光光学
光谱分析
自适应双光梳光谱
载波包络相位
重复频率
laser optics
spectrum analysis
adaptive dual-comb spectroscopy
carrier envelope phase
repetition rate
