Combined high-power terahertz vortex Bessel beams: formation and identification

N. Osintseva; V. Gerasimov; Yu. Choporova; V. Kukotenko; V. Pavelyev; B. Knyazev

doi:10.1117/12.2687532

26 November 2023 Combined high-power terahertz vortex Bessel beams: formation and identification

N. Osintseva, V. Gerasimov, Yu. Choporova, V. Kukotenko, V. Pavelyev, B. Knyazev

Proceedings Volume 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X; 127760J (2023) https://doi.org/10.1117/12.2687532
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Abstract

The push to improve data capacity in wireless networks has led to an increase in carrier frequency in the terahertz band. This has enabled the use of direct beams transmission due to the shorter wavelength. One method of further densification of transmitted communication channels is through the use of vortex Bessel beams, which allow for signal combination in a single channel. In addition, these beams offer improved beam stability through their unique features of non-diffraction and self-healing, which is particularly important in wireless transmission where atmospheric turbulence is a factor. Vortex Bessel beams are characterized by a topological charge, l, which cannot be determined from their intensity profile alone. Therefore, spatial filtering is necessary at the receiver stage to identify the desired mode carried by a distorted or combined beam. A diffractive optical element with a specially designed complex transmission can serve as a filter matched to the desired mode. This study presents the experimental results of Bessel mode identification using beams formed by binary spiral binary phase axicons that transform the Gaussian mode of high-power terahertz radiation from the Novosibirsk Free Electron Laser. The specified mode is passed through a filter (similar spiral binary axicon with |l| = 1, 2, 3, or 4, and a lens) and then detected by a pyroelectric camera in the lens focal plane. A positive response, indicated by a narrow peak, confirms the compatibility of the specified and filtering modes. Experiments were conducted on single-mode and combined beams (l = -1 and -2), and mode identification was also demonstrated for beams passed through an inhomogeneous medium.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

N. Osintseva, V. Gerasimov, Yu. Choporova, V. Kukotenko, V. Pavelyev, and B. Knyazev "Combined high-power terahertz vortex Bessel beams: formation and identification", Proc. SPIE 12776, Infrared, Millimeter-Wave, and Terahertz Technologies X, 127760J (26 November 2023); https://doi.org/10.1117/12.2687532

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KEYWORDS

Bessel beams

Terahertz radiation

Axicons

Optical filters

Free electron lasers

Multiplexing

Spiral phase plates

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