A broad range frequency measurement method for continuous and pulsed THz waves
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Published on: June 25, 2021
Xin Qi1, Houxiu Xiao1, Xiaotao Han1
1Wuhan National High Magnetic Field Center, Huazhong University of Science and Technology, Wuhan 430074, China.
Abstract:
This paper proposes a method to measure the frequency of terahertz (THz) waves based on the Zeeman effect and the high magnetic field technology with a wideband range from 60 GHz to 3 THz. As the frequency of THz waves absorbed by the sample is linear to the magnetic field in the Zeeman effect, the frequency can be measured by the magnetic field strength. A comparison study of THz frequency measurement was carried out in two magnet systems (a superconducting one and a pulsed one) to investigate the performance in two kinds of high magnetic fields. The experimental results of 60-700 GHz show that this method has high resolution (about 0.001%), excellent linearity, and good repeatability. Moreover, the proposed method can measure polychromatic signals simultaneously as well as the single pulse frequency in the order of tens of microseconds.
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