基于频率梳的太赫兹辐射强度测量
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国家重点研究发展计划(批准号:2017YFF0209704);国家自然科学基金(批准号:11874333)。


Terahertz spatial intensity measurements based on terahertz frequency comb
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the National Key R&D Program of China (Grant No:2017YFF0209704); the National Natural Science Foundation of China (Grant No. 11874333)

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    摘要:

    为实现太赫兹辐射特性精准认知,开展太赫兹辐射绝对强度测量研究。通过光学频率梳产生太赫兹频率梳,利用太赫兹频率梳实现太赫兹辐射源空间强度测量。本文利用电光采样和光电导探测两种方式,实现了100 GHz辐射源空间辐射强度测量;将100 GHz辐射总功率溯源到标准太赫兹功率计,实现太赫兹辐射强度绝对测量。分析比较了利用800 nm空间光进行电光采样和利用1550 nm光纤激光进行光电导探测的测量结果。本文在不同距离下,对太赫兹辐射源的空间辐射绝对强度进行了测量,实验揭示了太赫兹辐射传输的空间演化特性。

    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.

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孟 莹,邓玉强,郭树恒,孙 青,李超辰,方 波,曾九孙,蔡晋辉.基于频率梳的太赫兹辐射强度测量[J].红外与毫米波学报,2019,38(2):254~261]. MENG Ying, DENG Yu-Qiang, GUO Shu-Heng, SUN Qing, LI Chao-Chen, FANG Bo, ZENG Jiu-Sun, CAI Jin-Hui. Terahertz spatial intensity measurements based on terahertz frequency comb[J]. J. Infrared Millim. Waves,2019,38(2):254~261.]

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  • 收稿日期:2018-10-23
  • 最后修改日期:2018-11-24
  • 录用日期:2018-12-07
  • 在线发布日期: 2019-05-08
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