基于快速光延迟线的全光纤直采式太赫兹时域光谱系统  

Research on all fiber direct acquisition terahertz time domain spectroscopy system by using a fast optical delay line

作　　者：胡成伟 邱亮 HU Chengwei;QIU Liang(School of Optical-Electrical and Computer Engineering,University of Shanghai for Science&Technology,Shanghai 310110,China)

机构地区：[1]上海理工大学光电信息与计算机工程学院,太赫兹技术创新研究院,上海200082

出　　处：《光学技术》2020年第6期702-706,共5页Optical Technique

摘　　要：太赫兹时域光谱(THz-TDS)技术是太赫兹光谱研究的得力工具,但是其探测速度与信号品质亟待进一步的提升。提出了一种基于快速光延迟线的全光纤直采式太赫兹时域光谱系统。实验结果表明,系统在64ps的时间窗口下扫描频率可达到16Hz,信号频域动态范围超过85dB。对比传统锁相式扫描系统,不仅系统单帧太赫兹时域脉冲的信号质量更好,而且探测时间缩短为原来的1/40,为太赫兹时域光谱系统的实用化提供了一种可行的解决方案。Terahertz time-domain spectroscopy is a powerful tool for spectral research in terahertz band. But its detection speed and signal quality need to be further improved. An all fiber direct acquisition terahertz time domain spectrum system based on fast optical delay line is proposed. The experimental results show that the scanning frequency of the system can reach 16 Hz under 64 ps time window, and the dynamic range of frequency domain is more than 85 dB. Compared with the traditional phase-locked scanning system, not only the signal quality of single frame THz time-domain pulse is better, but also the detection time is shortened to 1/40 of the original, which provides a feasible solution for the practical application of THz time-domain spectrum system.

关 键 词：太赫兹 时域光谱 直采 探测速度 信号品质 

分 类 号：TN29[电子电信—物理电子学]