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Reduction of laser intensity scintillations in turbulent atmospheres using time averaging of a partially coherent beam

G P Berman1, A R Bishop2, B M Chernobrod1, V N Gorshkov1,3,4, D C Lizon5, D I Moody6, D C Nguyen5 and S V Torous3

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We demonstrate experimentally and numerically that the application of a partially coherent beam (PCB) in combination with time averaging leads to a significant reduction in the scintillation index. We use a simplified experimental approach in which the atmospheric turbulence is simulated by a phase diffuser. The role of the speckle size, the amplitude of the phase modulation and the strength of the atmospheric turbulence are examined. We obtain good agreement between our numerical simulations and our experimental results. This study provides a useful foundation for future applications of PCB-based methods of scintillation reduction in physical atmospheres.


PACS

42.68.Bz Atmospheric turbulence effects

92.60.hk Convection, turbulence, and diffusion

Subjects

Optics, quantum optics and lasers

Environmental and Earth science

Dates

Issue 22 (28 November 2009)

Received 19 June 2009, in final form 6 September 2009

Published 30 October 2009



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