Terahertz spatial intensity measurements based on terahertz frequency comb
Received:October 23, 2018  Revised:November 24, 2018  download
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Author NameAffiliationE-mail
MENG Ying College of Metrology Measurement Engineering,China Jiliang University,Hangzhou mengying_39@126.com 
DENG Yu-Qiang College of Metrology Measurement Engineering,China Jiliang University,Hangzhou yqdeng@nim.ac.cn 
GUO Shu-Heng College of Metrology Measurement Engineering,China Jiliang University,Hangzhou  
SUN Qing Optics Division,National Institute of Metrology  
LI Chao-Chen Optics Division,National Institute of Metrology  
FANG Bo College of Metrology Measurement Engineering,China Jiliang University,Hangzhou  
ZENG Jiu-Sun College of Metrology Measurement Engineering,China Jiliang University,Hangzhou  
CAI Jin-Hui College of Metrology Measurement Engineering,China Jiliang University,Hangzhou  
Abstract:Terahertz frequency comb, which is generated from femtosecond frequency comb, is applied to measurement of the spatial intensity of terahertz source. Two technologies, electro-optic sampling and photoconductive detection, are applied to generate terahertz frequency comb, and the spatial intensity of a 100 GHz source is measured with both of these two techniques. The total radiant power is traceable to a standard terahertz radiometer, and the absolute intensity of the terahertz source is obtained. The measurement results with both of the two techniques, electro-optic sampling with 800 nm femtosecond optical pulse in free space and photoconductive antenna detection with 1550 nm femtosecond optical pulse in fiber, are analyzed and compared. Moreover, the spatial intensities of the terahertz radiation at different distance away from the terahertz source are measured, and the involvement of the terahertz radiation in free space is experimentally studied.
keywords:Terahertz  metrology, optical  standards and  testing, terahertz  radiometry
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Copyright:《Journal of Infrared And Millimeter Waves》