Scintillation reduction for combined Gaussian-vortex beam propagating through turbulent atmosphere

G. P. Berman; V. N. Gorshkov; S. V. Torous

doi:10.1117/12.876218

10 February 2011 Scintillation reduction for combined Gaussian-vortex beam propagating through turbulent atmosphere

G. P. Berman, V. N. Gorshkov, S. V. Torous

Proceedings Volume 7924, Atmospheric and Oceanic Propagation of Electromagnetic Waves V; 79240G (2011) https://doi.org/10.1117/12.876218
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

We numerically examine the spatial evolution of the structure of coherent and partially coherent laser beams (PCBs), including the optical vortices, propagating in turbulent atmospheres. The influence of beam fragmentation and wandering relative to the axis of propagation (z-axis) on the value of the scintillation index (SI) of the signal at the detector is analyzed. A method for significantly reducing the SI, by averaging the signal at the detector over a set of PCBs, is described. This novel method is to generate the PCBs by combining two laser beams - Gaussian and vortex beams, with different frequencies (the difference between these two frequencies being significantly smaller than the frequencies themselves). In this case, the SI is effectively suppressed without any high-frequency modulators.

Citation Download Citation

G. P. Berman, V. N. Gorshkov, and S. V. Torous "Scintillation reduction for combined Gaussian-vortex beam propagating through turbulent atmosphere", Proc. SPIE 7924, Atmospheric and Oceanic Propagation of Electromagnetic Waves V, 79240G (10 February 2011); https://doi.org/10.1117/12.876218

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