Browsing by Author "Peters, Eduardo"

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    33
    (SPIE, 33) Peters, Eduardo; Sepúlveda, Marco; Scherz, Pablo; Nuñez, Leandro; Pérez, Darío G.; 33
    Optical turbulence induces distortions in amplitude and phase in any beam propagating through it, resulting in beam spreading, beam wandering, and irradiance fluctuations among other effects. Due to the dynamic nature of these effects, the complex field reconstruction of a perturbed beam presents a great experimental challenge. Interferometric wavefront reconstruction techniques require very sophisticated assemblies prone to alignment errors due to their high sensitivity to environmental disturbances. This hinders its experimental implementation. New complex phase retrieval methods overcome most of the limitations of interferometric methods: they are suitable for amplitude or phase objects (or both) and their reconstruction algorithms—based on propagation equations—make unnecessary any a-priori knowledge of the beam to be reconstructed. We propose an experimental implementation of a complex phase retrieval technique for the characterization of Gaussian beams propagating through turbulence. This technique is based on binary amplitude modulation using a digital micro-mirror device (DMD) which has proven to be suitable for dynamic applications. To our knowledge, this is the first experimental high-speed complex wavefront reconstruction of optical beams—by binary amplitude modulation—through controlled real turbulence. This experiment represents the first step in our research focused on understanding optical turbulence from an experimental point of view.
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    33
    (33, 33) Funes, Gustavo; Peters, Eduardo; Anguita, Jaime; 33
    We analyze the effect of spatial phase modulation using non-linear functions applied to singular warped beams to control their topological states and intensity distribution. Such beams are candidates for optical trapping and particle manipulation for their controllable pattern of intensities and singularities. We first simulate several kinds of warped beams to analyze their intensity profiles and propagation characteristics. Secondly, we experimentally validate the simulations and investigate the far-field profiles. By calculating the intensity gradients, we describe how these beams are qualified candidates for optical manipulation and trapping.
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    Analysis of practical fractional vortex beams at far field
    Peters, Eduardo; Funes, Gustavo; Martínez-León, L.; Tajahuerce, Enrique
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    Complete wavefront reconstruction of perturbed singular beams by single-pixel phase retrieval.
    (SPIE) Peters, Eduardo; Funes, Gustavo; Anguita, Jaime
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    Detection of Hermite-Gaussian modes in vortex beams affected by convective turbulence
    Salgado, Benjamin; Peters, Eduardo; Funes, Gustavo
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    Dynamics of Fractional Vortex Beams at Fraunhofer Diffraction Zone
    Peters, Eduardo; Funes, Gustavo; Martínez-León, L.; Tajahuerce, Enrique
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    Estimation of the Power Loss of a Soiled Photovoltaic Panel Using Image Analysis Techniques
    Brunel, Francois; López, Ricardo; García, Florencio; Peters, Eduardo; Funes, Gustavo
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    Phase retrieval by designed Hadamard complementary coded apertures
    Romero, Bastián; Scherz, Pablo; Díaz, Nelson; Tapia, Jorge; Cofré, Aarón; Peters, Eduardo; Vera, Esteban; Pérez, Darío G.
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    Using Image Analysis Techniques for Dust Detection Over Photovoltaic Panels
    Funes, Gustavo; Peters, Eduardo; Delpiano, José