华中科技大学学报（自然科学版）2025，Vol.53Issue(9)：52-58,7.DOI:10.13245/j.hust.250095
基于分布反馈式半导体激光泵浦光电导天线的太赫兹频域光谱仪研究
Research on Terahertz frequency domain spectrometer based on distributed feedback semiconductor laser-pumped photoconductive antenna
摘要
Abstract
THz frequency-domain spectroscopy based on optical difference-frequency generation was investigated in this paper,and a low-cost,high-sensitivity THz frequency-domain spectrometer solution was proposed.Through the coupling of tunable semiconductor lasers with photoconductive antennas,THz wave excitation and detection were achieved.The impact of factors such as bias voltage,modulation frequency,and phase-locking settings on system performance was discussed in the paper,with data acquisition,signal processing,and analysis being optimized.A frequency range of 0.1～1.1 THz,a maximum resolution of 1.2 GHz.This enables precise capture of subtle frequency changes when analyzing the terahertz spectrum.In the frequency range of 110～550 GHz,the signal-to-noise ratio of the system is maintained at 30 dB,ensuring the stability and reliability of the signal and effectively reducing the impact of noise interference on the spectrum analysis results.To further verify the reliability and practicality of the system,the water vapor absorption peak was measured using the system.The measurement results were compared and analyzed with the data in the database,and the results show that they are basically consistent.The deviation of the absorption peak position from the HITRAN database standard value is less than 0.5%,and the peak intensity error is controlled within 5%,verifying the reliability of the system in practical applications.关键词
太赫兹/光谱仪/光学差频/半导体激光器/光电导天线/频域光谱Key words
Terahertz/spectrometer/optical difference frequency/semiconductor laser/photoconductive antenna/frequency-domain spectroscopy分类
数理科学引用本文复制引用
黎璟乐,聂勇潇,钟慧,田野..基于分布反馈式半导体激光泵浦光电导天线的太赫兹频域光谱仪研究[J].华中科技大学学报（自然科学版）,2025,53(9):52-58,7.基金项目
科技部重点研发计划资助项目(2022YFA1604401) （2022YFA1604401）
国家自然科学基金资助项目(12325409,12388102,U23A6002). （12325409,12388102,U23A6002）
