Behavior of the laser beam wandering variance with the turbulent path length
| Autor: | Damián Gulich, Darío G. Pérez, Mario Garavaglia, Luciano Zunino, Gustavo Funes |
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| Rok vydání: | 2007 |
| Předmět: |
Hurst exponent
Physics Fractional Brownian motion Wave propagation Stochastic process business.industry Turbulence Atomic and Molecular Physics and Optics Displacement (vector) Electronic Optical and Magnetic Materials Optics Path length Electrical and Electronic Engineering Physical and Theoretical Chemistry business Brownian motion |
| Zdroj: | Optics Communications. 272:476-479 |
| ISSN: | 0030-4018 |
| DOI: | 10.1016/j.optcom.2006.12.020 |
| Popis: | We experimentally study the variance of the transverse displacement, or wandering, of a laser beam after it has traveled through indoor artificially convective turbulence. In a previous paper (Opt. Commun., vol. 242, p. 57, November 2004) we have modeled the atmospheric turbulent refractive index as a fractional Brownian motion. As a consequence, a different behavior is predicted for the wandering variance: it grows with L, the path length, as L2+2H, where H is the Hurst exponent associated to the fractional Brownian motion. The traditional cubic dependence is only recovered when H = 1/2—the ordinary Brownian motion. This is the case of strong turbulence or long path length. Otherwise, for weak turbulence and short path length deviations from the usual expression should be found. In this work we experimentally confirm the previous assertion. |
| Databáze: | OpenAIRE |
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