Real-Time Determination of Absolute Frequency in Continuous-Wave Terahertz Radiation with a Photocarrier Terahertz Frequency Comb Induced by an Unstabilized Femtosecond Laser

被引:3
|
作者
Minamikawa, Takeo [1 ,2 ]
Hayashi, Kenta [1 ]
Mizuguchi, Tatsuya [1 ]
Hsieh, Yi-Da [1 ,2 ]
Abdelsalam, Dahi Ghareab [1 ,2 ]
Mizutani, Yasuhiro [2 ,3 ]
Yamamoto, Hirotsugu [2 ,4 ]
Iwata, Tetsuo [1 ,2 ]
Yasui, Takeshi [1 ,2 ]
机构
[1] Univ Tokushima, Inst Sci & Technol, 2-1 Minami Josanjima, Tokushima 7708506, Japan
[2] JST, ERATO, MINOSHIMA Intelligent Opt Synthesizer Project, 2-1 Minami Josanjima, Tokushima 7708506, Japan
[3] Osaka Univ, Grad Sch Engn, 2-1 Yamadaoka, Suita, Osaka 5650871, Japan
[4] Utsunomiya Univ, Ctr Opt Res & Educ, 7-1-2 Yoto, Utsunomiya, Tochigi 3218585, Japan
基金
日本科学技术振兴机构;
关键词
Terahertz; Frequency comb; Absolute frequency measurement; Photoconductive antenna; Photoconductive mixing; Frequency metrology; GENERATOR;
D O I
10.1007/s10762-015-0237-6
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
A practical method for the absolute frequency measurement of continuous-wave terahertz (CW-THz) radiation uses a photocarrier terahertz frequency comb (PC-THz comb) because of its ability to realize real-time, precise measurement without the need for cryogenic cooling. However, the requirement for precise stabilization of the repetition frequency (f (rep)) and/or use of dual femtosecond lasers hinders its practical use. In this article, based on the fact that an equal interval between PC-THz comb modes is always maintained regardless of the fluctuation in f (rep), the PC-THz comb induced by an unstabilized laser was used to determine the absolute frequency f (THz) of CW-THz radiation. Using an f (rep)-free-running PC-THz comb, the f (THz) of the frequency-fixed or frequency-fluctuated active frequency multiplier chain CW-THz source was determined at a measurement rate of 10 Hz with a relative accuracy of 8.2 x 10(-13) and a relative precision of 8.8 x 10(-12) to a rubidium frequency standard. Furthermore, f (THz) was correctly determined even when fluctuating over a range of 20 GHz. The proposed method enables the use of any commercial femtosecond laser for the absolute frequency measurement of CW-THz radiation.
引用
收藏
页码:473 / 485
页数:13
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