Frequency noise in Terahertz dual-comb spectroscopy using two repetition-frequency stabilized and synchronized femtosecond lasers

被引：0

作者：

Wu, Jingrui ^{[1
,8
]}

He, Fei ^{[1
]}

Guo, Xuguang ^{[1
]}

Zheng, Xingguo ^{[1
]}

Zhang, Huiping ^{[1
]}

Qiu, Liang ^{[1
]}

Li, Yinwei ^{[1
]}

Ma, Tengzhou ^{[1
,2
]}

Zhang, Xicheng ^{[3
]}

Shkurinov, Alexander P. ^{[1
,4
,5
,6
]}

Zhu, Yiming ^{[1
,7
]}

机构：

[1] Univ Shanghai Sci & Technol, Terahertz Technol Innovat Res Inst, Engn Res Ctr Opt Instrument & Syst, Minist Educ, Shanghai 200093, Peoples R China

[2] Shanghai EntryExit Inspect & Quarantine Bur, Tech Ctr Ind Prod & Raw Mat Inspect & Testing, Shanghai 200135, Peoples R China

[3] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

[4] Lomonosov Moscow State Univ, Dept Phys, Moscow 19991, Russia

[5] Lomonosov Moscow State Univ, Int Laser Ctr, Moscow 19991, Russia

[6] RAS, Branch FSRC Crystallog & Photon, ILIT RAS, Svyatoozerskaya 1, Shatura 140700, Moscow Region, Russia

[7] Tongji Univ, Shanghai Inst Intelligent Sci & Technol, Shanghai 200092, Peoples R China

[8] Hamamatsu Photon China Co Ltd, Beijing 100020, Peoples R China

来源：

INFRARED PHYSICS & TECHNOLOGY | 2025年 / 147卷

基金：

上海市自然科学基金; 中国国家自然科学基金;

关键词：

Terahertz; Dual comb; Frequency noise; Frequency domain; Time domain; TIME-DOMAIN SPECTROSCOPY; VIBRATIONAL-MODES; PRINCIPLES;

D O I：

10.1016/j.infrared.2025.105796

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

Terahertz (THz) dual-comb spectroscopy (THz-DCSS) is a competitive spectral technique due to its high frequency resolution. However, because the pump and detection femtosecond (fs) pulses are from two stabilized fs lasers, the perfect mutual coherence is difficult to reach, which prohibits long time data average and improving frequency resolution. Here, two frequency noise sources, the residual unlocked and transferred ones are investigated for a THz dual comb spectrometer (THz-DCSM). In time domain, the amplitude noise plays a dominate role on the performance of THz-DCSS; the repetition-frequency noises are negligible within Fourier-transform frequency resolution. In frequency domain, the relative synchronization error originating from the instantaneous frequency differences between the two fs lasers is 4 x 10(-13) (Delta f/f); the relative frequency resolution is similar to 4 x 10(-10), limited by the radio frequency reference. Our investigations are helpful for improving the performance of THz-DCSS and developing high frequency resolution THz spectroscopy.

引用

页数：12