Terahertz quantum cascade laser dual-comb sources with high-repetition-rate detuning

Terahertz dual-comb spectroscopy has emerged as a critical tool for real-time reaction monitoring and fast molecular dynamics studies. The acquisition rate of dual-comb spectroscopy is limited by the repetition rate difference between the two frequency combs. In this work, we engineer the cavity length difference between two quantum cascade laser (QCL)-based combs to achieve a record repetition rate detuning of 229.14 MHz, corresponding to a minimum time resolution of 4.36 ns. At equivalent frequency resolution, our system reduces the theoretical acquisition time by a factor of eight compared to a dual-comb system with a 21.60 MHz detuning. To further improve the signal-to-noise ratio (SNR) of the comb lines, we apply a computational phase correction algorithm. The combination of rapid acquisition and enhanced SNR makes this high-repetition-rate detuning dual-comb system highly promising for time-resolved spectroscopic applications.

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Publication Details

Journal
Optics Letters
Published
2025-08-25
DOI
https://doi.org/10.1364/ol.572016
Primary Topic
Spectroscopy and Laser Applications
Type
article
Field-Weighted Citation Impact
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article

Terahertz quantum cascade laser dual-comb sources with high-repetition-rate detuning

Gui‐Bin Liu, Yanming Lü, Shumin Wu, Hua Li et al.
Optics Letters
Spectroscopy and Laser Applications
article

Terahertz quantum cascade laser dual-comb sources with high-repetition-rate detuning

Gui‐Bin Liu, Yanming Lü, Shumin Wu, Hua Li, Kang Zhou, Xuhong Ma, Ziping Li, Juncheng Cao, Binbin Liu, Min Li, Lulu Zheng, Xianglong Bi, Wenjian Wan
article en

Abstract

Terahertz dual-comb spectroscopy has emerged as a critical tool for real-time reaction monitoring and fast molecular dynamics studies. The acquisition rate of dual-comb spectroscopy is limited by the repetition rate difference between the two frequency combs. In this work, we engineer the cavity length difference between two quantum cascade laser (QCL)-based combs to achieve a record repetition rate detuning of 229.14 MHz, corresponding to a minimum time resolution of 4.36 ns. At equivalent frequency resolution, our system reduces the theoretical acquisition time by a factor of eight compared to a dual-comb system with a 21.60 MHz detuning. To further improve the signal-to-noise ratio (SNR) of the comb lines, we apply a computational phase correction algorithm. The combination of rapid acquisition and enhanced SNR makes this high-repetition-rate detuning dual-comb system highly promising for time-resolved spectroscopic applications.

Optics LettersVol. 50(19)
Chongqing Normal University (CN), University of Shanghai for Science and Technology (CN), Chinese Academy of Sciences (CN), University of Chinese Academy of Sciences (CN), East China Normal University (CN)
Affordable and clean energy
Openalex Percentile: Top 80%
Spectroscopy and Laser Applications
DOISourceOpenAlex
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Terahertz quantum cascade laser dual-comb sources with high-repetition-rate detuning — Gui‐Bin Liu, Yanming Lü, et al. · Optics Letters (2025) | TGRS Research Map | TGRS