Terahertz dual-comb spectroscopy: A comparison between time- and frequency-domain operation modes

Fu, Hui; Jiang, XingLe; Wu, Jun; Qiu, Liang; Yuan, Ye; Guo, Xuguang; Zhu, Yiming

doi:10.1016/j.infrared.2021.103699

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…It has been proven in the infrared band that the time-of-flight (TOF) ranging of the elapsed time between optical pulses could result in large ambiguities, but high precision can be achieved with the help of dual-comb configurations [ 12 , 13 , 14 , 15 ]. The involved technique of asynchronous optical sampling (ASOPS) has also been adopted in THz generation and detection, which is referred to as the THz dual-comb system (THz-DCS) due to the stability of the carrier-envelope phase [ 16 , 17 , 18 , 19 , 20 ]. Recently, the THz-DCS has been adopted in THz TOF ranging research to measure the distance of stationary objects, exhibiting an accuracy of −551 μm and a resolution of 113 μm [ 21 ].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Time-of-Flight Ranging with Adaptive Clock Asynchronous Optical Sampling

Liu

Xia

et al. 2023

Sensors

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We propose and implement a terahertz time-of-flight ranging system based on adaptive clock asynchronous optical sampling, where the timing jitter is corrected in real time to recover the depth information in the acquired interferograms after compensating for laser instabilities using electronic signal processing. Consequently, the involved measurement uncertainties caused by the timing jitter during the terahertz sampling process and the noise intensity of the terahertz electric field have been reduced by the utilization of the adaptive clock. The achieved uncertainty range is about 2.5 μm at a 5 cm distance after averaging the acquisition time of 1876 ms 5000 times, showing a significant improvement compared with the asynchronous optical sampling using a constant clock. The implemented terahertz ranging system only uses free-running mode-locked lasers without any phase-locked electronics, and this favors simple and robust operations for subsequent applications that extend beyond the laboratory conditions.

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