Dr. Gustavo L. Funes Profile

Dr. Gustavo L. Funes

at Univ de los Andes

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Author

Publications (11)

Proceedings Article | 22 August 2020 Presentation + Paper

Complete wavefront reconstruction of perturbed singular beams by single-pixel phase retrieval

Eduardo Peters, Gustavo Funes, Jaime Anguita

Proceedings Volume 11506, 115060P (2020) https://doi.org/10.1117/12.2568026

KEYWORDS: Phase retrieval, Reconstruction algorithms, Digital micromirror devices, Binary data, Holography, Sensors, Atmospheric propagation, Wavefront reconstruction

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Proceedings Article | 6 September 2019 Presentation + Paper

Detection of Hermite-Gaussian modes in vortex beams affected by convective turbulence

Gustavo Funes, Benjamin Salgado, Eduardo Peters, Jaime Anguita

Proceedings Volume 11133, 1113304 (2019) https://doi.org/10.1117/12.2529970

KEYWORDS: Beam propagation method, Turbulence, Atmospheric propagation, Zernike polynomials, Distortion, Spiral phase plates, Atmospheric turbulence, Superposition, Analytical research, Optical vortices

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Proceedings Article | 6 September 2019 Presentation + Paper

Deep learning for image-based classification of OAM modes in laser beams propagating through convective turbulence

Jose Delpiano, Gustavo Funes, Jaime Cisternas, Sebastian Galaz, Jaime Anguita

Proceedings Volume 11133, 1113305 (2019) https://doi.org/10.1117/12.2529303

KEYWORDS: Turbulence, Neural networks, Image classification, Laser beam propagation, Convolutional neural networks, Free space optics, Atmospheric optics, Data communications

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Proceedings Article | 6 September 2019 Presentation + Paper

Analysis and mitigation of turbulence-induced distortions using adaptive optics for improved communication signal detection

Carlos Pirela, Jaime Anguita, Gustavo Funes, Jaime Cisternas

Proceedings Volume 11133, 1113303 (2019) https://doi.org/10.1117/12.2529314

KEYWORDS: Adaptive optics, Signal detection, Turbulence, Atmospheric propagation, Optical communications, Wavefront sensors, Free space optics

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Proceedings Article | 6 September 2019 Presentation + Paper

Phase retrieval of Laguerre-Gaussian beams through atmospheric turbulence by binary amplitude modulation

Eduardo Peters, Gustavo Funes, Jaime Anguita

Proceedings Volume 11133, 111330S (2019) https://doi.org/10.1117/12.2528556

KEYWORDS: Atmospheric propagation, Digital micromirror devices, Phase retrieval, Reconstruction algorithms, Binary data, Atmospheric turbulence, Amplitude modulation, Spiral phase plates, Computer simulations

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Proceedings Article | 10 October 2018 Presentation + Paper

Detection of multiple coaxial optical vortices with a Shack-Hartman sensor in atmospheric turbulence

Jaime Cisternas, Gustavo Funes, Jaime Anguita

Proceedings Volume 10770, 107700T (2018) https://doi.org/10.1117/12.2321675

KEYWORDS: Wavefront sensors, Optical vortices, Atmospheric turbulence, Turbulence, Atmospheric propagation, Spatial light modulators, Microlens array, Diffraction gratings

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Proceedings Article | 17 October 2013 Paper

Characterizing inertial and convective optical turbulence by detrended fluctuation analysis

Gustavo Funes, Eduardo Figueroa, Damián Gulich, Luciano Zunino, Darío Pérez

Proceedings Volume 8890, 889016 (2013) https://doi.org/10.1117/12.2028698

KEYWORDS: Turbulence, Atmospheric propagation, Optical turbulence, Laser beam propagation, Sensors, Geometrical optics, Fractal analysis, Atmospheric optics, Atmospheric turbulence, Refractive index

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Proceedings Article | 1 November 2012 Paper

Retrieving atmospheric turbulence features from differential laser tracking motion data

Darío Pérez, Ángel Férnandez, Gustavo Funes, Damián Gulich, Luciano Zunino

Proceedings Volume 8535, 853508 (2012) https://doi.org/10.1117/12.974652

KEYWORDS: Turbulence, Sensors, Beam splitters, Atmospheric propagation, Error analysis, Atmospheric turbulence, Laser beam propagation, Data modeling, Refractive index, Optical turbulence

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We have previously introduced the Differential Laser Tracking Motion Meter (DLTMM) [Proc. SPIE 7476, 74760D (2009)] as a robust device to determine many optical parameters related to atmospheric turbulence. It consisted of two thin laser beams—whose separations can be modified—that propagate through convective air, then each random wandering was registered with position detectors, sampled at 800 Hz. The hypothesis that the analysis of differential coordinates is less affected by noise induced by mechanical vibration was tested. Although we detected a trend to the Kolmogorov’s power exponent with the turbulence increasing strength, we were unable to relate it to the Rytov variance. Also, analyzing the behaviour of the multi-fractal degree estimator (calculated by means of multi-fractal detrended fluctuation analysis, MFDFA) at different laser-beam separations for these differential series resulted in the appreciation of characteristic spatial scales; nevertheless, errors induced by the technique forbid an accurate comparison with scales estimated under more standard methods. In the present work we introduce both an improved experimental setup and refined analyses techniques that eliminate many of the uncertainties found in our previous study. A new version of the DLTMM employs cross-polarized laser beams that allows us to inspect more carefully distances in the range of the inner-scale, thus even superimposed beams can be discriminated. Moreover, in this experimental setup the convective turbulence produced by electrical heaters previously used was superseded by a chamber that replicates isotropic atmospheric turbulence—anisotropic turbulence is also reproducible. Therefore, we are able to replicate the same state of the turbulent flow, specified by Rytov variance, for every separation between beams through the course of the experience. In this way, we are able to study the change in our MFDFA quantifiers with different strengths of the turbulence, and their relation with better known optical quantities. The movements of the two laser beams are recorded at 6 kHz; this apparent oversampling is crucial for detecting the turbulence’s characteristics scales under improved MFDFA techniques. The estimated characteristic scales and multi-fractal nature detected by this experiment provides insight into the non-Gaussian nature of propagated light.

Proceedings Article | 1 October 2009 Paper

Turbulence characterization by studying laser beam wandering in a differential tracking motion setup

Darío Pérez, Luciano Zunino, Damián Gulich, Gustavo Funes, Mario Garavaglia

Proceedings Volume 7476, 74760D (2009) https://doi.org/10.1117/12.830234

KEYWORDS: Turbulence, Sensors, Anisotropy, Laser beam propagation, Atmospheric propagation, Statistical analysis, Beam splitters, Mirrors, Lanthanum, Motion estimation

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Proceedings Article | 1 November 2006 Paper

Angle-of-arrival variance behavior and scale filtering in indoor turbulence

Damián Gulich, Gustavo Funes, Luciano Zunino, Darío Pérez, Mario Garavaglia

Proceedings Volume 6522, 65220L (2006) https://doi.org/10.1117/12.723049

KEYWORDS: Turbulence, Collimation, Motion models, Lanthanum, Sensors, Stochastic processes, Fractal analysis, Data modeling, System on a chip, Americium

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Proceedings Article | 1 November 2006 Paper

Behavior of a laser beam wandering with turbulent path length

Gustavo Funes, Damián Gulich, Luciano Zunino, Darío Pérez, Mario Garavaglia

Proceedings Volume 6522, 65220M (2006) https://doi.org/10.1117/12.723051

KEYWORDS: Turbulence, Atmospheric propagation, Refractive index, Atmospheric modeling, Laser beam propagation, Lanthanum, Motion models, Geometrical optics, Atmospheric optics, Atmospheric physics

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Showing 5 of 11 publications

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