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电信和无线电工程
SJR: 0.203 SNIP: 0.44 CiteScore™: 1

ISSN 打印: 0040-2508
ISSN 在线: 1943-6009

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电信和无线电工程

DOI: 10.1615/TelecomRadEng.v74.i8.60
pages 725-733

RESONATOR METHODS OF MEASURING REFRACTIVE INDEX OF A TRANSPARENT SUBSTANCE IN THE TERAHERTZ BAND

M. I. Dzyubenko
O.Ya. Usikov Institute for Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12 Academician Proskura St., Kharkiv 61085, Ukraine; V. Karazin National University of Kharkiv, 4 Svobody Sq., Kharkiv 61022, Ukraine; Kharkiv National University of Radio Electronics, 14 Nauka Ave, Kharkiv 61166, Ukraine
V. K. Kiseliov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine; V.N.Karazin Kharkiv National University 4, Svobody sq., 61022, Kharkiv, Ukraine
V. P. Radionov
A. Usikov Institute of Radio Physics and Electronics, National Academy of Sciences of Ukraine, 12, Academician Proskura Str., Kharkiv 61085, Ukraine

ABSTRACT

Measurement of the refractive index of transparent substances in the terahertz band is required for the development of devices and systems that operate in this band. Submillimeter lasers are one of the most affordable sources of coherent THz radiation. They have features that allow measuring the refractive index of transparent substances. The method for on-line measurement of the refractive index of transparent substances in the terahertz band is provided. The measurable substance is placed in a quasi-optical resonator. Measurements are performed by means of coherent terahertz electromagnetic radiation. Test measurements of the refractive index are performed. Substantiation of reducing the error of the refractive index measurement, taking into account the physics of the processes in the space of resonance submillimeter laser system, are provided. It was shown that the accuracy of measurement of the refractive index can be greatly increased by placing the test substance in the resonator of the THz laser. The presented techniques for measuring the refractive index of transparent substances in the THz band can be used in various fields of science, technology and medicine.

REFERENCES

  1. Gorbunov, Ye.P., Denisov, V.F., and Nesterov, P.K., Use of a multichannel laser interferometer for vertical probing to measure the plasma density profile in T-15 Tokamak.

  2. Bezborodov, V.I., Kiseliov, V.K., Kuleshov, Ye.M. , Evaluation of the influence of defects on the quality of composites using a quasi-optical polarization-frequency reflectometry in sub-terahertz domain.

  3. Kiseliov, V.K., Makolinets, V.I., Mitryayeva, N.A., and Radionov, V.P., Application of terahertz laser technology to investigate the influence of HHF radiation on the tumor process.

  4. Kiseliov, V.K., Dzyubenko, M.I., and Radionov, V.P., Method for determining refractive index of a transparent substance.

  5. Goldsmith P.F., Quasioptical Systems.


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