Terahertz asynchronous optical sampling spectroscopy with lock-in detection

被引：0

作者：

Cai, Wen ^{[1
]}

He, Fei ^{[1
]}

Yao, Yifan ^{[1
]}

Cai, Miao ^{[1
]}

Fu, Jingjing ^{[1
]}

Cai, Yating ^{[1
]}

Zhang, Xunlin ^{[1
]}

Zhang, Shichen ^{[1
]}

You, Guanjun ^{[1
]}

Guo, Xuguang ^{[1
]}

Zhu, Yiming ^{[1
,2
]}

机构：

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

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

来源：

OPTICS EXPRESS | 2025年 / 33卷 / 12期

基金：

中国国家自然科学基金;

关键词：

TIME-DOMAIN SPECTROSCOPY;

D O I：

10.1364/OE.562343

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate a terahertz asynchronous optical sampling (THz-ASOPS) spectrometer incorporating a lock-in amplifier. The experimental setup employs a high-voltage pulse generator to drive a photoconductive antenna emitter, generating precisely modulated terahertz pulses that are subsequently detected by a photoconductive antenna detector. The detection system features a two-stage amplification process: initial signal amplification through a low-noise current preamplifier, followed by processing with a digital lock-in amplifier. Experimental characterization demonstrates significant performance enhancements, with a 3-fold improvement in the time-domain peak signal-to-noise ratio and a 5 dB increase in the spectral dynamic range. These results substantiate the effectiveness of the lock-in detection approach in enhancing THz-ASOPS spectroscopic performance.

引用

页码：25570 / 25579

页数：10

共 34 条

[1] Self-triggered Asynchronous Optical Sampling Terahertz Spectroscopy using a Bidirectional Mode-locked Fiber Laser [J].