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Study on a gyrotron quasi-optical mode converter for terahertz imaging

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  • Chengxin Zhang
  • Wenjie Fu
  • Yang Yan

Abstract

In this paper, a quasi-optical mode converter for terahertz imaging is presented. This design is based on a 0.22 THz TE03 gyrotron oscillator. It includes a Vlasov launcher, an elliptical reflector and a parabolic reflector, which is used to convert TE03 cylindrical waveguide mode to a Gaussian-like beam. The quasi-optical system is analyzed in terms of geometric optics theory and the vector diffraction theory. Numerical optimization code is programmed by MATLAB software for analyzing the quasi-optical system. Simulation results show that the power transmission efficiency of the operating cavity mode to a fundamental Gaussian distribution is 82.14%, the output Gaussian beam can be propagated over 0.8 m without divergence and the scalar Gaussian mode content is 98.2%. A cold test experiment platform is built up to verify the design based on numerical calculation. In experiment, the scalar Gaussian mode content of 97.0% is measured which shows good agreement with numerical calculation.

Suggested Citation

  • Chengxin Zhang & Wenjie Fu & Yang Yan, 2021. "Study on a gyrotron quasi-optical mode converter for terahertz imaging," Journal of Electromagnetic Waves and Applications, Taylor & Francis Journals, vol. 35(2), pages 176-184, January.
    • Handle: RePEc:taf:tewaxx:v:35:y:2021:i:2:p:176-184
    DOI: 10.1080/09205071.2020.1828186
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