干涉法测量连续太赫兹波频谱
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摘要
描述了一种基于惠特曼干涉理论,采用步进扫描方式工作的连续太赫兹波频谱测量方法。对所提出的连续太赫兹波频谱测量方法进行了理论分析,并用计算机对频谱及能量密度分布进行实时采集。根据该方法搭建测量光路采集太赫兹波频谱及能量密度数据。将实验数据与理论计算数据进行比较,得到了良好的一致性结果。采用镀银反射镜、热释电探测器与斩波器构建测量光路,对干涉强度进行单点探测,利用扫描步进方式获得了频率为210 GHz连续式太赫兹波源返波振荡器(BWO)及400 GHz耿氏振荡器的频谱和能量密度分布,测量精度为1 GHz。结果表明,采用此干涉方法可以准确测量连续式太赫兹波源的频谱及能量密度分布,为今后实现太赫兹波段成像等领域的应用提供了有力的支持。
A method of measuring continuous terahertz frequency spectrum is provided based on Whitman interference theory effect and step-scanned working mode. The continuous terahertz spectrum measurement is calculated theoretically, and the spectrum and the energy density are taken by the computer. The measuring optical structure is set up to obtain the data of terahertz frequency-spectrum and energy density distribution. The measuring data accord well with that of theoretical analysis. The silvering reflect mirror,pyroelectric detector and chopper are used to build the measuring optical path to detect the interference intensity of one point. Frequency spectrum and energy density distribution of 210 GHz continuous terahertz backward-wave oscillator(BWO) and 400 GHz Gunn oscillator are obtained by step-scanned working mode. The accuracy of this measurement is 1 GHz. These results show that, using this method the frequency spectrum and energy density distribution of continuous terahertz wave source can be measured accurately. It provides a strong support for terahertz wave imaging research.
A method of measuring continuous terahertz frequency spectrum is provided based on Whitman interference theory effect and step-scanned working mode. The continuous terahertz spectrum measurement is calculated theoretically, and the spectrum and the energy density are taken by the computer. The measuring optical structure is set up to obtain the data of terahertz frequency-spectrum and energy density distribution. The measuring data accord well with that of theoretical analysis. The silvering reflect mirror,pyroelectric detector and chopper are used to build the measuring optical path to detect the interference intensity of one point. Frequency spectrum and energy density distribution of 210 GHz continuous terahertz backward-wave oscillator(BWO) and 400 GHz Gunn oscillator are obtained by step-scanned working mode. The accuracy of this measurement is 1 GHz. These results show that, using this method the frequency spectrum and energy density distribution of continuous terahertz wave source can be measured accurately. It provides a strong support for terahertz wave imaging research.
引文
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2 Zhang Cunlin,Zhang Yan,Zhao Guozhong,et al..Terahertz detection and imaging[M].Beijing:National Defense Industry Press,2008:64-69.张存林,张岩,赵国忠,等.太赫兹感测与成像[M].北京:国防工业出版社,2008:64-69.
3 N Karpowicz,H Zhong,C Zhang,et al..Compact continuous-wave subterahertz system for inspection applications[J].Appl Phys Lett,2005,86(5):054105.
4 B B Hu,M C Nuss.Imaging with terahertz wave[J].Opt Lett,1995,20(16):1716-1718.
5 D M Mittleman,S Hunsche,L Boivin,et al..T-ray tomography[J].Opt Lett,1995,22(12):904-906.
6 Sun Mengdie,Tan Shaoyang,Guo Fei,et al..Photonic integrated circuit for generation of terahertz pumping source by difference-frequency generation[J].Laser&Optoelectronics Progress,2015,52(9):091302.孙梦蝶,谭少阳,郭菲,等.差频法产生太赫兹抽运源的光子集成芯片[J].激光与光电子学进展,2015,52(9):091302.
7 T Lu,Y Hui,J Zhang,et al..Phase detection for continuous Terahertz wave[C].SPIE,2015,9625:962506.
8 Xie Jinghui,Zhao Dazun,Yan Jixiang.Physical optics[M].Beijing:Beijing Institute of Technology Press,2005:125-127.谢敬辉,赵达尊,阎吉祥.物理光学教程[M].北京:北京理工大学出版社,2005:125-127.
9 M Kujawinska,D W Robinson.Multichannel phase-stepped holographic interferometry[J].Appl Opt,1988,27(2):312-320.
10 Yuntao He,Haiping Huang,Yuesong Jiang,et al..Optical phase control for MMW sparse aperture upconversion imaging[J].Chin Opt Lett,2014,12(5):051101.
11 Zhu Wenhua,Chen Lei,Li Jinpeng,et al..Analysis of diffraction intensity and wavefront error in point diffraction interferometer[J].Laser&Optoelectronics Progress,2015,52(6):061201.朱文华,陈磊,李金鹏,等.点衍射干涉仪中针孔衍射光强与波面误差分析[J].激光与光电子学进展,2015,52(6):061201.