Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry

A system for measuring terahertz spectrum is proposed based on optical interferometer theory, and is experimentally demonstrated by using a backward-wave oscillator as the terahertz source. A high-resolution, high-precision interferometer is constructed by using a pyroelectric detector and a chopper...

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Published inChinese physics B Vol. 25; no. 8; pp. 98 - 102
Main Author 卢铁林 袁慧 孔令琴 赵跃进 张亮亮 张存林
Format Journal Article
LanguageEnglish
Published 01.08.2016
Subjects
Feasibility
Fourier transforms
Imaging
Interferometers
Interferometry
Inverse
Mathematical analysis
Oscillators
光学干涉仪
太赫兹
干涉术
成像实验
热释电探测器
碳纤维复合材料
辐射光谱
连续波
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Summary:A system for measuring terahertz spectrum is proposed based on optical interferometer theory, and is experimentally demonstrated by using a backward-wave oscillator as the terahertz source. A high-resolution, high-precision interferometer is constructed by using a pyroelectric detector and a chopper. The results show that the spectral resolution is better than 1 GHz and the relative error of frequency is less than 3%. The terahertz energy density distribution is calculated by an inverse Fourier transform and tested to verify the feasibility of the interferometric approach. Two kinds of carbon-fiber composites are imaged. The results confirm that the interferometer is useful for transmission imaging of materials with different thickness values.
Bibliography:A system for measuring terahertz spectrum is proposed based on optical interferometer theory, and is experimentally demonstrated by using a backward-wave oscillator as the terahertz source. A high-resolution, high-precision interferometer is constructed by using a pyroelectric detector and a chopper. The results show that the spectral resolution is better than 1 GHz and the relative error of frequency is less than 3%. The terahertz energy density distribution is calculated by an inverse Fourier transform and tested to verify the feasibility of the interferometric approach. Two kinds of carbon-fiber composites are imaged. The results confirm that the interferometer is useful for transmission imaging of materials with different thickness values.
Tie-Lin Lu, Hui Yuan, Ling-Qin Kong, Yue-Jin Zhao, Liang-Liang Zhang, and Cun-Lin Zhang（1Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;2Department of Physics, Capital Normal University, Beijing 100048, China）
terahertz, spectral measurements, interferometer, imaging
11-5639/O4
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 23
ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/25/8/080702