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

doi:10.1088/1674-1056/ac90b2

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.

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

Received: 18 June 2022
Revised: 28 August 2022
Accepted manuscript online: 09 September 2022

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

Fund: 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).

Corresponding Authors: Bo Su
E-mail: subo75@cnu.edu.cn

Cite this article:

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) Integrated system of traditional THz time-domain spectroscopy and asynchronous optical sampling 2023 Chin. Phys. B 32 048702

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