Journal
INFRARED PHYSICS & TECHNOLOGY
Volume 115, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.infrared.2021.103699
Keywords
Time-domain spectroscopy; Dual-comb spectroscopy; Terahertz frequency comb; Radio frequency comb
Categories
Funding
- National Natural Science Foundation of China [61731020, 61988102, 61722111]
- 111 Project [D18014]
- Science and Technology Commission Shanghai Municipality [YDZX20193100004960]
Ask authors/readers for more resources
In terahertz dual-comb spectroscopies, electrical time delay lines are used to prolong the sampling time for consecutive terahertz pulses, improving frequency resolution. The system operates in both frequency-domain and time-domain modes, allowing for simultaneous acquisition of wideband and narrowband terahertz spectral information.
In terahertz dual-comb spectroscopies (THz-DCSs), electrical time delay lines are utilized to replace the mechanical ones widely used in traditional terahertz time-domain spectroscopic systems (THz-TDSs). Due to the usage of electrical delay line, the sampling time is effectively prolonged and the consecutive terahertz pulses can be sampled continuously, which leads to the improvement of frequency resolution and makes it possible for THzDCSs work in dual (frequency- and time-domain, FD and TD) operation modes. Here, a THz-DCS is established by using two repetition-frequency-locked femtosecond (fs) lasers with a slight repetition frequency difference. A spectrum analyzer is used to directly record the terahertz spectral data. Alternatively, the terahertz transient pulses are sampled and recorded, and the terahertz spectra are obtained by Fourier transforming the TD data. The experimental results show that the terahertz spectra acquired in FD and TD are in good agreement with each other. For the dual-mode THz-DCS, the wideband terahertz spectral information and the specified narrowband spectral information with high frequency resolution can be simultaneously acquired, which is helpful for searching sharp-peaked fingerprint spectral features in a broad terahertz frequency range.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available