Measurement of absolute frequency of continuous-wave terahertz radiation in real time using a free-running, dual-wavelength mode-locked, erbium-doped fibre laser

A single, free-running, dual-wavelength mode-locked, erbium-doped fibre laser was exploited to measure the absolute frequency of continuous-wave terahertz (CW-THz) radiation in real time using dual THz combs of photo-carriers (dual PC-THz combs). Two independent mode-locked laser beams with differen...

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Published in:Scientific reports 2017-02, Vol.7 (1), p.42082-42082, Article 42082
Main Authors: Hu, Guoqing, Mizuguchi, Tatsuya, Zhao, Xin, Minamikawa, Takeo, Mizuno, Takahiko, Yang, Yuli, Li, Cui, Bai, Ming, Zheng, Zheng, Yasui, Takeshi
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Language:English
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639/624/1111/1112
639/624/400/561
Antennae
Erbium
Humanities and Social Sciences
Lasers
multidisciplinary
Science
Terahertz frequencies
Wavelength
Wavelengths
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cited_by cdi_FETCH-LOGICAL-c438t-a6c4ef1fdb758d5693f83715b0a264eb3cc425cb47cf813f6cce5feaf15adf503
cites cdi_FETCH-LOGICAL-c438t-a6c4ef1fdb758d5693f83715b0a264eb3cc425cb47cf813f6cce5feaf15adf503
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creator Hu, Guoqing
Mizuguchi, Tatsuya
Zhao, Xin
Minamikawa, Takeo
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Yang, Yuli
Li, Cui
Bai, Ming
Zheng, Zheng
Yasui, Takeshi
description A single, free-running, dual-wavelength mode-locked, erbium-doped fibre laser was exploited to measure the absolute frequency of continuous-wave terahertz (CW-THz) radiation in real time using dual THz combs of photo-carriers (dual PC-THz combs). Two independent mode-locked laser beams with different wavelengths and different repetition frequencies were generated from this laser and were used to generate dual PC-THz combs having different frequency spacings in photoconductive antennae. Based on the dual PC-THz combs, the absolute frequency of CW-THz radiation was determined with a relative precision of 1.2 × 10 −9 and a relative accuracy of 1.4 × 10 −9 at a sampling rate of 100 Hz. Real-time determination of the absolute frequency of CW-THz radiation varying over a few tens of GHz was also demonstrated. Use of a single dual-wavelength mode-locked fibre laser, in place of dual mode-locked lasers, greatly reduced the size, complexity, and cost of the measurement system while maintaining the real-time capability and high measurement precision.
doi_str_mv 10.1038/srep42082
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subjects 639/624/1111/1112
639/624/400/561
Antennae
Erbium
Humanities and Social Sciences
Lasers
multidisciplinary
Science
Terahertz frequencies
Wavelength
Wavelengths
title Measurement of absolute frequency of continuous-wave terahertz radiation in real time using a free-running, dual-wavelength mode-locked, erbium-doped fibre laser
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