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DOI: 10.17586/1023-5086-2026-93-12-3-13
УДК: 621.373:826
Formation of radiation from lasers with a coaxial active medium
Низьев В.Г., Сейдгазов Р.Д. Формирование излучения лазеров с коаксиальной активной средой // Оптический журнал. 2026. Т. 93. № 12. С. 3–13. http://doi. org/10.17586/1023-5086-2026-93-12-3-13
Niziev V.G., Seidgazov R.D. Formation of radiation from lasers with a coaxial active medium [in Russian] // Opticheskii Zhurnal. 2026. V. 93. № 12. P. 3–13. http://doi.org/ 10.17586/1023-5086-2026-93-12-3-13
Subject of the study. Radiation quality of lasers with coaxial geometry of the active medium. Objective of the study. To present a scientific justification for overcoming the primary drawback of the coaxial laser (azimuthal beam inhomogeneity) and to ensure the generation of a laser beam corresponding to the lowest-order annular mode. Method. Analytical and numerical calculations were carried out aimed at achieving the stated goal. The solution method involves two stages: generating annular radiation uniform over the azimuthal angle and converting it to a lower-order annular mode. Main results. It has been proven that with radial (azimuthal) polarization, the output radiation is uniform over the azimuthal angle. It has been shown that the local polarization selectivity of a diffraction mirror at zero angle of incidence for generating a beam of radial (azimuthal) polarization can reach tens of percent. Calculations were performed for the propagation of ring radiation, which is not a Laguerre–Gaussian mode at the laser output, for different widths of the output radiation ring of a coaxial laser. A method for significantly improving the radiation quality by converting the output radiation ring of a coaxial laser into a low-order ring mode using an extracavity axicon is demonstrated. Practical significance. The obtained results open up the possibility of creating a coaxial laser with a solution to the issue of radiation quality based on the principles considered.
coaxial lasers, radially (azimuthally) polarized beams, diffraction mirrors, laser radia tion quality, laser beam propagation
Acknowledgements:the work was carried out within the state assignment of NRC «Kurchatov Insti tute», the theme 3F.8.1.
OCIS codes: 140.3410, 050.1960, 230.1950, 050.6624
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