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Telecommunications and Radio Engineering

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ISSN Druckformat: 0040-2508

ISSN Online: 1943-6009

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FOCUSING OF MODES WITH AN INHOMOGENEOUS SPATIAL POLARIZATION OF THE DIELECTRIC RESONATOR OF A TERAHERTZ LASER

Volumen 79, Ausgabe 2, 2020, pp. 105-116
DOI: 10.1615/TelecomRadEng.v79.i2.30
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ABSTRAKT

Wave beams with non-uniform spatial polarization of radiation are necessary for solving important fundamental and applied problems related to the interaction of electromagnetic waves of the terahertz range with matter - surface diagnostics of materials, thin films, biological objects, information transmission, and processing systems, achieving subwave resolution in tomography, communication systems, etc. The results are presented in the literature on focusing on pulsed radiation beams in the terahertz range. Data on the focusing of continuous radiation beams are practically absent. The spatial-energy characteristics of laser beams having an inhomogeneous spatial polarization at their moderate and sharp focusing are theoretically investigated. As the radiation understudy, in the numerical simulation of the focusing of wave beams in the terahertz range, we used the modes of a laser waveguide dielectric resonator that coincide with the eigenmodes of a hollow dielectric waveguide. Symmetric and asymmetric modes with both spatially inhomogeneous azimuthal, radial, and homogeneous linear field polarizations are studied. The components of the electric field of laser beams during their propagation in free space were studied using the Rayleigh-Sommerfeld integrals in the nonparaxial approximation. The effect of the focusing lens on laser radiation was taken into account using the amplitude-phase correction function. The distributions of the total intensity of the resonator modes and their individual field components in the focal region of the lens are studied. The obtained results expand the knowledge about the features of focusing terahertz laser beams.

REFERENZEN
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REFERENZIERT VON
  1. Degtyarev Andrey V., Dubinin Mykola M., Gurin Oleg V., Maslov Vyacheslav A., Muntean Konstantin I., Ryabyh Valeriy N., Senyuta Vladislav S., Control of tightly focused laser beams in the THz range , Microwave and Optical Technology Letters, 63, 11, 2021. Crossref

  2. Degtyarev Andrey, Dubinin Mykola, Gurin Oleg, Maslov Vyacheslav, Muntean Konstantin, Ryabyh Valery, Senyuta Vladislav, Changing the Parameters of Tightly Focused THz Laser Beams, 2021 46th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2021. Crossref

  3. Degtyarev Andrey, Dubinin Mykola, Gurin Oleg, Maslov Vyacheslav, Muntean Konstantin, Ryabyh Valery, Senyuta Vladislav, Control of Focused Laser Beams with Different Spatial Polarization, 2021 Photonics North (PN), 2021. Crossref

  4. Degtyarеv A., Dubinin M., Gurin O., Maslov V., Muntean K., Ryabykh V., Senyuta V., Svystunov O., CONTROL OVER HIGHER-ORDER TRANSVERSE MODES IN A WAVEGUIDE-BASED QUASI-OPTICAL RESONATOR, RADIO PHYSICS AND RADIO ASTRONOMY, 27, 2, 2022. Crossref

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