Dorilian Lopez-Mago — Page 2

arXiv2019

Generation of light beams with custom orbital angular momentum and tunable transverse intensity symmetries

We introduce a novel and simple modulation technique to tailor optical beams with a customized amount of orbital angular momentum (OAM). The technique is based on the modulation of the angular spectrum of a seed beam, which allows us to specify in an independent manner the value of OAM and the shape of the resulting beam transverse intensity. We experimentally demonstrate our method by arbitrarily shaping the radial and angular intensity distributions of Bessel and Laguerre-Gauss beams, while their OAM value remains constant. Our experimental results agree with the numerical and theoretical predictions.

physics.optics↗

arXiv2019

On the overall polarisation properties of full Poincaré beams

We analyse the polarisation properties of full Poincaré beams. We consider different configurations, such as Laguerre-Poincaré, Bessel-Poincaré, and Lambert-Poincaré beams. The former is the original Poincaré beam produced by a collinear superposition of two Laguerre-Gauss beams with orthogonal polarisations. For this configuration, we describe the Stokes statistics and overall invariant parameters. Similarly, Bessel-Poincaré beams are produced by the collinear superposition of Bessel beams with orthogonal polarisations. We describe their properties under propagation and show that they behave as a free-space polarisation attractor transforming elliptical polarisations to linear polarisations. We also propose a novel type of full Poincaré pattern, one which is generated by a Lambert projection of the Poincaré sphere on the transverse plane, and hence we call them Lambert-Poincaré. This configuration, contrary to the Laguerre-Poincaré, provides a finite region containing all polarisation states uniformly distributed on the Poincaré sphere.

physics.optics↗