太赫兹双梳光谱中重复频率差影响的研究  

Research on the effect of repetition frequency difference for terahertz dual-comb spectroscopy

作　　者：吴静睿 郭旭光 WU Jingrui;GUO Xuguang(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,上海200093

出　　处：《光学仪器》2022年第5期20-27,共8页Optical Instruments

基　　金：国家自然科学基金(61731020)。

摘　　要：太赫兹双梳光谱技术因其高频率分辨率和高灵敏度等优点,近年来成为一种有力的光谱测量技术。为了提高光谱系统的探测性能,本文分析了双梳光谱技术在时域和频域中的采样原理及方法,基于两台飞秒激光器搭建了一套重复频率可调的太赫兹双梳光谱系统。通过改变一台光频梳的重复频率,系统地研究了不同重复频率差对太赫兹双梳光谱系统性能的影响。结果表明有效范围内的重复频率差越小,探测到光谱质量越高。当重复频率差为10 Hz时,太赫兹双梳光谱系统的探测性能最佳。此研究为太赫兹双梳光谱技术选择最合适的重复频率差提供了方法。Terahertz dual-comb spectroscopy has become a powerful spectral measurement technology recently due to its high frequency resolution and high sensitivity.According to the sampling principles and methods of dual-comb spectroscopy in time domain and frequency domain,a terahertz spectroscopic system with tunable repetition frequency based on two femtosecond lasers is established in order to improve the detection performance of the spectroscopic system in this paper.By changing the repetition frequency of an optical frequency comb,the effect of repetition frequency difference on the terahertz dual-comb spectrum is analyzed systemically.The results show that the smaller the repetition frequency difference in the effective range,the higher the detected spectral quality.The detection performance of the terahertz dual-comb spectroscopy system is optimal when the repetition frequency difference is 10 Hz.These results provide a method to select the most suitable repetition frequency difference for terahertz dual-comb spectroscopy.

关 键 词：光学频率梳 太赫兹波 双梳光谱 重复频率差 

分 类 号：O433.1[机械工程—光学工程]