Artículo
Multiscale permutation entropy analysis of laser beam wandering in isotropic turbulence
Olivares Zamora, Felipe Esteban
; Zunino, Luciano José
; Gulich, Maximiliano Damián
; Pérez, Darío Gabriel; Rosso, Osvaldo Aníbal
Fecha de publicación:
10/2017
Editorial:
American Physical Society
Revista:
Physical Review E
ISSN:
2470-0053
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We have experimentally quantified the temporal structural diversity from the coordinate fluctuations of a laser beam propagating through isotropic optical turbulence. The main focus here is on the characterization of the long-range correlations in the wandering of a thin Gaussian laser beam over a screen after propagating through a turbulent medium. To fulfill this goal, a laboratory-controlled experiment was conducted in which coordinate fluctuations of the laser beam were recorded at a sufficiently high sampling rate for a wide range of turbulent conditions. Horizontal and vertical displacements of the laser beam centroid were subsequently analyzed by implementing the symbolic technique based on ordinal patterns to estimate the well-known permutation entropy. We show that the permutation entropy estimations at multiple time scales evidence an interplay between different dynamical behaviors. More specifically, a crossover between two different scaling regimes is observed. We confirm a transition from an integrated stochastic process contaminated with electronic noise to a fractional Brownian motion with a Hurst exponent H = 5/6 as the sampling time increases. Besides, we are able to quantify, from the estimated entropy, the amount of electronic noise as a function of the turbulence strength. We have also demonstrated that these experimental observations are in very good agreement with numerical simulations of noisy fractional Brownian motions with a well-defined crossover between two different scaling regimes.
Palabras clave:
Multiscale Permutation Entropy
,
Laser
,
Beam Wandering
,
Isotropic Turbulence
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Articulos(CIOP)
Articulos de CENTRO DE INVEST.OPTICAS (I)
Articulos de CENTRO DE INVEST.OPTICAS (I)
Articulos(IFLYSIB)
Articulos de INST.FISICA DE LIQUIDOS Y SIST.BIOLOGICOS (I)
Articulos de INST.FISICA DE LIQUIDOS Y SIST.BIOLOGICOS (I)
Citación
Olivares Zamora, Felipe Esteban; Zunino, Luciano José; Gulich, Maximiliano Damián; Pérez, Darío Gabriel; Rosso, Osvaldo Aníbal; Multiscale permutation entropy analysis of laser beam wandering in isotropic turbulence; American Physical Society; Physical Review E; 96; 4; 10-2017; 1-7; 042207
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