Determination of the topological charge of a bessel-gauss beam using the diffraction pattern through of an equilateral aperture

The topological charge TC of an electromagnetic wave is relate with their wavefront spatial distribution. Electromagnetic waves with factor azimuthal exp(ilθ) in its phase, have TC integer (l=m) or non-integer (l=M). These electromagnetic waves with a well-defined of TC can be produced in the visibl...

Full description

Autores:
Acevedo, Cristian Hernando
Díaz, Carlos Fernando
Torres-Moreno, Yezid
Tipo de recurso:
Article of journal
Fecha de publicación:
2015
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/60753
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/60753
http://bdigital.unal.edu.co/59085/
Palabra clave:
62 Ingeniería y operaciones afines / Engineering
Bessel-Gauss beam
Topological charge of the light (TC)
integer TC
non-integer TC
Triangular aperture.
Rights
openAccess
License
Atribución-NoComercial 4.0 Internacional
Description
Summary:The topological charge TC of an electromagnetic wave is relate with their wavefront spatial distribution. Electromagnetic waves with factor azimuthal exp(ilθ) in its phase, have TC integer (l=m) or non-integer (l=M). These electromagnetic waves with a well-defined of TC can be produced in the visible regime by computer generated holographic masks with fork shaped. In this paper, we study the formed triangle lattice distribution in the intensity Fraunhofer regime using numerical simulations of the Bessel-Gauss beams with integer and non-integer TC. The beam is diffracted by equilateral triangular aperture to measure both their sign and magnitude. In addition, we showed the experimental results of the intensity in far field regime product of diffraction of Bessel-Gauss beams with integer and noninteger TC by the equilateral triangular aperture. Partial and qualitative explanations have been proposed for the diffraction of electromagnetic beams with topological charge. This paper presents a complete analysis for qualitative and quantitative explanation of diffraction of a beam with topological charge by a triangular aperture. The results of such diffraction are obtained by numerical simulation or experimentally.