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

doi:10.1088/1674-1056/25/8/080702

中国物理B ›› 2016, Vol. 25 ›› Issue (8): 80702-080702.doi: 10.1088/1674-1056/25/8/080702

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

Tie-Lin Lu(卢铁林), Hui Yuan(袁慧), Ling-Qin Kong(孔令琴), Yue-Jin Zhao(赵跃进), Liang-Liang Zhang(张亮亮), Cun-Lin Zhang(张存林)

1 Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;
2 Department of Physics, Capital Normal University, Beijing 100048, China

收稿日期:2016-01-29 修回日期:2016-03-16 出版日期:2016-08-05 发布日期:2016-08-05
通讯作者: Yue-Jin Zhao E-mail:yjzhao@bit.edu.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61377109 and 11374007).

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

Tie-Lin Lu(卢铁林)¹, Hui Yuan(袁慧)¹, Ling-Qin Kong(孔令琴)¹, Yue-Jin Zhao(赵跃进)¹, Liang-Liang Zhang(张亮亮)², Cun-Lin Zhang(张存林)²

1 Beijing Key Laboratory for Precision Optoelectronic Measurement Instrument and Technology, School of Optoelectronics, Beijing Institute of Technology, Beijing 100081, China;
2 Department of Physics, Capital Normal University, Beijing 100048, China

Received:2016-01-29 Revised:2016-03-16 Online:2016-08-05 Published:2016-08-05
Contact: Yue-Jin Zhao E-mail:yjzhao@bit.edu.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 61377109 and 11374007).

摘要/Abstract

摘要： 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.

关键词: terahertz, spectral measurements, interferometer, imaging

Abstract: 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.

Key words: terahertz, spectral measurements, interferometer, imaging

中图分类号: (Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors)

07.57.Kp

52.70.Kz (Optical (ultraviolet, visible, infrared) measurements) 07.60.Ly (Interferometers)

卢铁林, 袁慧, 孔令琴, 赵跃进, 张亮亮, 张存林. Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry[J]. 中国物理B, 2016, 25(8): 80702-080702.

Tie-Lin Lu(卢铁林), Hui Yuan(袁慧), Ling-Qin Kong(孔令琴), Yue-Jin Zhao(赵跃进), Liang-Liang Zhang(张亮亮), Cun-Lin Zhang(张存林). Experimental research on spectrum and imaging of continuous-wave terahertz radiation based on interferometry[J]. Chin. Phys. B, 2016, 25(8): 80702-080702.

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

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

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