中国物理B ›› 2023, Vol. 32 ›› Issue (4): 48702-048702.doi: 10.1088/1674-1056/ac90b2

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Integrated system of traditional THz time-domain spectroscopy and asynchronous optical sampling

Jing Ding(丁晶), Qing-Hao Meng(孟庆昊), Yan Shen(沈妍), Chen-Xin Ding(丁晨鑫), Bo Su(苏波)†, Hai-Lin Cui(崔海林), and Cun-Lin Zhang(张存林)   

  1. Department of Physics, Capital Normal University, Beijing Advanced Innovation Center for Imaging Theory and Technology, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
  • 收稿日期:2022-06-18 修回日期:2022-08-28 接受日期:2022-09-09 出版日期:2023-03-10 发布日期:2023-03-30
  • 通讯作者: Bo Su E-mail:subo75@cnu.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3200100) and the National Natural Science Foundation of China (Grant No. 61575131).

Integrated system of traditional THz time-domain spectroscopy and asynchronous optical sampling

Jing Ding(丁晶), Qing-Hao Meng(孟庆昊), Yan Shen(沈妍), Chen-Xin Ding(丁晨鑫), Bo Su(苏波)†, Hai-Lin Cui(崔海林), and Cun-Lin Zhang(张存林)   

  1. Department of Physics, Capital Normal University, Beijing Advanced Innovation Center for Imaging Theory and Technology, Beijing Key Laboratory for Terahertz Spectroscopy and Imaging, Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China
  • Received:2022-06-18 Revised:2022-08-28 Accepted:2022-09-09 Online:2023-03-10 Published:2023-03-30
  • Contact: Bo Su E-mail:subo75@cnu.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant No. 2021YFB3200100) and the National Natural Science Foundation of China (Grant No. 61575131).

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摘要： Terahertz time-domain spectroscopy (THz-TDS) system, as a new means of spectral analysis and detection, plays an increasingly pivotal role in basic scientific research. However, owing to the long scanning time of the traditional THz-TDS system and the complex control of the asynchronous optical scanning (ASOPS) system, which requires frequent calibration, we combine traditional THz-TDS and ASOPS systems to form a composite system and propose an all-fiber trigger signal generation method based on the time overlapping interference signal generated by the collinear motion of two laser pulses. Finally, the time-domain and frequency-domain spectra are obtained by using two independent systems in the integrated systems. It is found that the full width at half maximum (FWHM) of the time-domain spectra and the spectral width of the frequency-domain spectra are almost the same, but the sampling speed of the ASOPS system is significantly faster than that of the traditional THz-TDS system, which conduces to the study of the transient characteristics of substances.

关键词: terahertz time-domain spectroscopy (THz-TDS), asynchronous optical scanning (ASOPS) system, integrated system, trigger signal

Abstract: Terahertz time-domain spectroscopy (THz-TDS) system, as a new means of spectral analysis and detection, plays an increasingly pivotal role in basic scientific research. However, owing to the long scanning time of the traditional THz-TDS system and the complex control of the asynchronous optical scanning (ASOPS) system, which requires frequent calibration, we combine traditional THz-TDS and ASOPS systems to form a composite system and propose an all-fiber trigger signal generation method based on the time overlapping interference signal generated by the collinear motion of two laser pulses. Finally, the time-domain and frequency-domain spectra are obtained by using two independent systems in the integrated systems. It is found that the full width at half maximum (FWHM) of the time-domain spectra and the spectral width of the frequency-domain spectra are almost the same, but the sampling speed of the ASOPS system is significantly faster than that of the traditional THz-TDS system, which conduces to the study of the transient characteristics of substances.

Key words: terahertz time-domain spectroscopy (THz-TDS), asynchronous optical scanning (ASOPS) system, integrated system, trigger signal

中图分类号: 

  • 87.50.U-
43.60.Qv (Signal processing instrumentation, integrated systems, smart transducers, devices and architectures, displays and interfaces for Acoustic systems)