摘要
Optical frequency combs, which are generated by the cascade of a phase modulator and a Mach–Zehnder intensity modulator, are used as a polychromatic signal source in the terahertz imaging system to improve imaging quality. The interference effect caused by the monochromatic wave has been greatly suppressed.The required optical power in the presented system is as low as～30% of that in the system using the Er-doped fiber amplifier as a source, which can reduce cost and protect photodiodes from damage. This work provides an effective, low power consumption, low cost, and easy way to realize terahertz imaging with high quality and can be used in future security inspections.
Optical frequency combs, which are generated by the cascade of a phase modulator and a Mach–Zehnder intensity modulator, are used as a polychromatic signal source in the terahertz imaging system to improve imaging quality. The interference effect caused by the monochromatic wave has been greatly suppressed.The required optical power in the presented system is as low as～30% of that in the system using the Er-doped fiber amplifier as a source, which can reduce cost and protect photodiodes from damage. This work provides an effective, low power consumption, low cost, and easy way to realize terahertz imaging with high quality and can be used in future security inspections.
作者
Dixiang Shao
Chen Yao
Tao Zhou
Rong Zhang
Zhanglong Fu
Songlin Zhuang
Juncheng Cao
邵棣祥;姚辰;周涛;张戎;符张龙;庄松林;曹俊诚(Shanghai Key Laboratory of Modern Optical System and Engineering Research Center of Optical Instrument and System, Ministry of Education, University of Shanghai for Science and Technology;Key Laboratory of Terahertz Solid-State Technology, Shanghai Institute of Microsystem and Information Technology,Chinese Academy of Sciences)
基金
supported by the 973 Program of China(No.2014CB339803)
the National Natural Science Foundation of China(Nos.61574155 and 61404149)
the Major National Development Project of Scientific Instrument and Equipment(No.2011YQ150021)
the National Science and Technology Major Project(No.2011ZX02707)
the Shanghai Municipal Commission of Science and Technology(Nos.14530711300,15560722000,14ZR1447500,15YF1414400,15JC1403800,and 15DZ0500103)
