This paper shows the experimental and theoretical results obtained for encoding data using light beams with different values of orbital angular momentum. Light beams with orbital angular momentum were generated using holographic masks with different values of topological charge, an displayed using a transmission spatial light modulator. Furthermore, we showed the results obtained for the characterization of the spatial light modulator in the amplitude-coupled regime by using the retarder-rotor model.
Key words:Orbital angular momentum of a light, data multiplexing, spatial light modulator, retarder-rotor model.
RESUMEN:El presente trabajo muestra los resultados experimentales y teóricos obtenidos para la codificación de datos utilizando haces luminosos con diferentes valores de momento angular orbital. Los haces luminosos con momento angular orbital fueron generados utilizando mascaras holográficas con diferentes valores de carga topológica, y desplegadas dinámicamente empleando un modulador espacial de luz por transmisión. Además se muestran los resultados obtenidos para la caracterización del modulador espacial de luz en el régimen acoplado en intensidad usando el modelo retardadorrotor.Palabras clave: Momento angular orbital de la luz, codificación de datos, modulador especial de luz, modelo retardador rotor.
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.
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