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of 452
pro vyhledávání: '"Alexey A. Kovalev"'
Autor:
Alexey A. Kovalev
Publikováno v:
Археология евразийских степей, Vol 5, Pp 38-68 (2023)
The article investigates the problem of the formation of a hoard composed from early bronze “Scythian-type” cauldrons with ring-shape handles and Eastren Zhou ritual tripods "ding", found on the river Buduun-gol in the Khuder sum of the Selenge a
Externí odkaz:
https://doaj.org/article/74acdec5103f4a98b1509a6ebcd45524
Publikováno v:
Applied Sciences, Vol 14, Iss 14, p 6305 (2024)
It is shown in this work that, with strong focusing of a beam with optical vortex and circular polarization, three energy flows take place in the focal plane: direct longitudinal, reverse longitudinal and azimuthal transverse flows. Calculations are
Externí odkaz:
https://doaj.org/article/960c2339be2241c1a74a01cd59f3f576
Publikováno v:
Photonics, Vol 11, Iss 5, p 430 (2024)
We analyze the tight focusing of a generalized Poincaré beam using a Richards–Wolf formalism. Conventional Poincaré beams are superpositions of two Laguerre–Gaussian beams with orthogonal polarization, while the generalized Poincaré beams are
Externí odkaz:
https://doaj.org/article/bb50434b81f84d50b9d22b7024d5561b
Autor:
Victor V. Kotlyar, Alexey A. Kovalev, Alexey M. Telegin, Elena S. Kozlova, Sergey S. Stafeev, Alexander Kireev, Kai Guo, Zhongyi Guo
Publikováno v:
Applied Sciences, Vol 14, Iss 9, p 3926 (2024)
In this work, using a Richards-Wolf formalism, we derive explicit analytical relationships to describe vectors of the major and minor axes of polarization ellipses centered in the focal plane when focusing a cylindrical vector beam of integer order n
Externí odkaz:
https://doaj.org/article/48fed45add034d038cc347350c310b24
Publikováno v:
Micromachines, Vol 15, Iss 3, p 350 (2024)
Two linked gear wheels in a micromachine can be simultaneously rotated in opposite directions by using a laser beam that has in its section areas the spin angular momentum (SAM) of the opposite sign. However, for instance, a cylindrical vector beam h
Externí odkaz:
https://doaj.org/article/0a48618232a94d0d88a3e6428a19a9ed
Publikováno v:
Applied Sciences, Vol 14, Iss 5, p 1759 (2024)
Paraxial beam modes, which propagate in space and focus without changing their transverse intensity pattern, are of great value for multiplexing transmitted data in optical communications, both in waveguides and in free space. The best-known paraxial
Externí odkaz:
https://doaj.org/article/ea4bda6d816347f8b6771a1e788780b2
Publikováno v:
Photonics, Vol 10, Iss 11, p 1247 (2023)
The Richards–Wolf formulas not only adequately describe a light field at a tight focus, but also make it possible to describe a light field immediately behind an ideal spherical lens, that is, on a converging spherical wave front. Knowing all proje
Externí odkaz:
https://doaj.org/article/c0a0bc6dc6f44956b9ba2889a1f7b789
Autor:
Victor V. Kotlyar, Alexey A. Kovalev
Publikováno v:
Photonics, Vol 10, Iss 11, p 1288 (2023)
We investigate a simple paraxial vector beam, which is a coaxial superposition of two single-ringed Laguerre–Gaussian (LG) beams, linearly polarized along the horizontal axis, with topological charges (TC) n and −n, and of two LG beams, linearly
Externí odkaz:
https://doaj.org/article/f191fc14fcd24f72b181b2fabbff8e38
Publikováno v:
Photonics, Vol 10, Iss 8, p 915 (2023)
If a vortex propagation-invariant beam is given by all its intensity nulls, then its topological charge (TC) can be defined easily: its TC is equal to the sum of topological charges of all optical vortices in these intensity nulls. If, however, a pro
Externí odkaz:
https://doaj.org/article/e7672cf34bd142c79f11c9c55d86671d
Publikováno v:
Micromachines, Vol 14, Iss 7, p 1470 (2023)
Elements of micromachines can be driven by light, including structured light with phase and/or polarization singularities. We investigate here a paraxial vector Gaussian beam with an infinite number of polarization singularities residing evenly on a
Externí odkaz:
https://doaj.org/article/844559a647474e2dbf96439628967beb