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- Title
Topological Charge and Asymptotic Phase Invariants of Vortex Laser Beams.
- Authors
Kovalev, Alexey A.; Kotlyar, Victor V.; Nalimov, Anton G.
- Abstract
It is well known that the orbital angular momentum (OAM) of a light field is conserved on propagation. In this work, in contrast to the OAM, we analytically study conservation of the topological charge (TC), which is often confused with OAM, but has quite different physical meaning. To this end, we propose a huge-ring approximation of the Huygens–Fresnel principle, when the observation point is located on an infinite-radius ring. Based on this approximation, our proof of TC conservation reveals that there exist other quantities that are also propagation-invariant, and the number of these invariants is theoretically infinite. Numerical simulation confirms the conservation of two such invariants for two light fields. The results of this work can find applications in optical data transmission to identify optical signals.
- Subjects
VECTOR beams; LASER beams; HUYGENS-Fresnel principle; LIGHT transmission; ANGULAR momentum (Mechanics); BESSEL beams
- Publication
Photonics, 2021, Vol 8, Issue 10, p445
- ISSN
2304-6732
- Publication type
Article
- DOI
10.3390/photonics8100445