太赫兹光梳光谱高速数据采集系统  

Terahertz Optical Comb High-Speed Data Acquisition System

作　　者：解东平 王霄 杨存亮 李敏 夏宇 李爽 曾和平[1,3] Xie Dongping;Wang Xiao;Yang Cunliang;Li Min;Xia Yu;Li Shuang;Zeng Heping(State Key Laboratory of Precision Spectroscopy Science and Technology,East China Normal University,Shanghai 200062,China;School of Optical Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China;Chongqing Institute of East China Normal University,Chongqing 401121,China)

机构地区：[1]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 [2]上海理工大学光电信息与计算机工程学院,上海200093 [3]华东师范大学重庆研究院,重庆401121

出　　处：《应用激光》2023年第6期145-149,共5页Applied Laser

基　　金：国家自然科学基金重大科研仪器研制项目(11727812);精密光谱科学与技术国家重点实验室开放课题。

摘　　要：描述一种基于高速光学异步采样(ASOPS)方法的太赫兹光谱数据采集系统,使用两台重频差为50 Hz的飞秒脉冲激光器分别作为泵浦光和探测光;使用LT-InGaAs/InAlAs光电导天线产生和接收太赫兹信号,使用采样率可调、采样模式可选的数据采集系统采集时域信号和获取光谱。试验得到的谱宽为0.06~4 THz,信噪比大于60 dB。在301.6 Msa/s的采样率和50 Hz扫描频率下,试验测量的水蒸气吸收光谱中吸收线的频率与HITRAN数据库中公布的非常接近,最大误差为12 GHz。A terahertz optical comb spectral data acquisition system based on high-speed optical asynchronous sampling(ASOPS)method is described.Two femtosecond pulse lasers with a repetition frequency difference of 50 Hz are used as the pump light and the probe light respectively.LT-InGaAs/InAlAs optical antenna is used to generate and receive terahertz signals,and a RF data acquisition system with adjustable sampling rate and optional sampling mode is used to collect time-domain signals and analyze spectral transformation.The spectral width is 0.06~4 THz and the SNR is greater than 60 dB.At the sampling rate of 301.6 MSa/s and the scanning frequency of 50 Hz,the frequency of absorption lines in the experimentally measured water vapor absorption spectrum is very close to that published in the HITRAN database,with a maximum error of 12 GHz.

关 键 词：太赫兹时域光谱 光学异步采样 数据采集 现场可编程门阵列 

分 类 号：O436[机械工程—光学工程]