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The investigation of the features of focusing vortex super-Gaussian beams with a variable-height diffractive axicon
D.A. Savelyev 1,2

1 Samara National Research University, 443086, Samara, Russia, Moskovskoye Shosse 34,
2 IPSI RAS – Branch of the FSRC "Crystallography and Photonics" RAS,
443001, Samara, Russia, Molodogvardeyskaya 151

 PDF, 2618 kB

DOI: 10.18287/2412-6179-CO-862

Pages: 214-221.

Full text of article: Russian language.

Abstract:
Spatial intensity distributions of the Laguerre-superGauss modes (1,0) as well as a super-Gaussian beam with radial and circular polarization were investigated versus changes in the height of a diffractive axicon. The height of the relief of the optical element varied from 0.25λ to 3λ. The modeling by a finite-difference time-domain method showed that variations in the height of the diffractive axicon significantly affect the diffraction pattern in the near field of the axicon. The smallest focal spot size for a super-Gaussian beam was obtained for radial polarization at a height equal to two wavelengths. The minimum size of the focal spot for the Laguerre-superGauss mode (1,0) was obtained for circular "–" polarization with an element height equal to a quarter of the wavelength.

Keywords:
sharp focusing, FDTD, super-Gaussian beam, Laguerre-super Gauss modes (1,0), axicon.

Citation:
Savelyev DA. The investigation of the features of focusing vortex super-Gaussian beams with a variable-height diffractive axicon. Computer Optics 2021; 45(2): 214-221. DOI: 10.18287/2412-6179-CO-862.

Acknowledgements:
This work was supported by the Russian Science Foundation under project No. 20-72-00051 (Sections "The investigation of the diffraction of a super-Gaussian beam with a varying axicon height", "The investigation of the diffraction of Laguerre-super-Gauss modes (1.0) with a varying axicon height", and "Conclusion"), the RF Ministry of Science and Higher Education, within government project No. 0777-2020-0017  (Section "Passing of super-Gaussian beams  through a binary diffractive axicon"), and within the government project 007-GZ/Ch3363/26 of FSRC "Crystallography and Photonics" RAS (Section "Introduction").

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