Lens design and verification used for terahertz space transmission
Received:December 22, 2016  Revised:April 09, 2017  download
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Author NameAffiliationE-mail
YANG Qiu-Jie Key Laboratory of Space Active Opto-Electronics TechnologyShanghai Institute of Technical Physics,Chinese Academy of Sciences yqj488112gxx@163.com 
HE Zhi-Ping Shanghai Institute of Technical Physics hzping@mail.sitp.ac.cn 
SHU Rong Shanghai Institute of Technical Physics shurong@mail.sitp.ac.cn 
Abstract:Terahertz beams are a kind of Gaussian beam with a big divergence angle and its wave front cannot be simplified to a plane or a spherical wave. All the theoretical derivations from the classical electromagnetic theory and ABCD laws support the following conclusions: firstly, a positive lens converges the terahertz beam in front of the focal plane instead of on the focal plane; secondly, a negative lens which matches the radius of the Gaussian beam’s wave front is more appropriate for terahertz beam collimation. Experiments show that a negative lens with f′=-188 mm at the matching position, z=100 mm, can improve the terahertz beam collimation from 6° to 0.1°. And 20-m terahertz space transmission was realized with a very simple optical scheme.
keywords:terahertz  lens  lasers  transmission
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Copyright:《Journal of Infrared And Millimeter Waves》