Details

Autor(en) / Beteiligte

• Chernykh, Aleksey V.
• Petrov, Nikolay V.

Titel

Optical vortex trajectory of the edge-diffracted single-charged Laguerre-Gaussian beam

Ist Teil von

• Optics and lasers in engineering, 2021-04, Vol.139, p.106504, Article 106504

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The theory of the vortex behavior during the beam blocking by a half-plane are given.•Two diffraction perturbation are considered: weak and strong.•The parameter responsible for the twist degree of OV trajectory coils is introduced.•A new approach for obstacles localization with OV trajectory theory is put forward. The paper deals with the edge diffraction of the single charged Laguerre-Gaussian beam outside the waist. Based on the Kirchhoff-Fresnel integral, the behavior of the optical vortex (OV) migration during sequential beam blocking by the straight edge of the screen is performed analytically. Universal combination of the diffracting-beam parameters determining the shape for the OV spiral trajectories is revealed. Parametric equations describing the OV dislocation dependent on the beam screening degree are derived. In addition, the spiral trajectory, which describes the OV positions in the case of the screen-edge translatory motion across the incident beam under conditions of the weak diffraction perturbation, is obtained. As a result, the equation for a wider region of diffraction perturbation is selected as a best matching function for a certain variation interval of the beam parameters. The work has prepared the basis for solving the inverse diffraction problem: determining parameters of the beam diffractive interaction with obstacles from the migration trajectory of the optical vortex.