Share Email Print
cover

Proceedings Paper

Scintillation index for N Gaussian laser beams with different wavelengths in weak atmospheric turbulence
Author(s): A. Peleg; J. V. Moloney
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

We study the scintillation index of N partially overlapping lowest order Gaussian laser beams with different wavelengths in weak atmospheric turbulence. Assuming a Von Karman turbulence spectrum and slow detector response and using the Rytov approximation we calculate the longitudinal and radial components of the scintillation index for typical free-space laser communication setups. We find the initial beam separation that minimizes the longitudinal scintillation and corresponds to the optimal beam configuration. Further reduction of the longitudinal scintillation is obtained by optimizing with respect to both initial beam separation and initial spot size. The longitudinal scintillation of the optimal N-beam configurations is inversely proportional to N, resulting in a 92% reduction for a 9-beam system compared with the single beam value. The existence of the minimum of longitudinal scintillation is not very sensitive to the form of the turbulence spectrum. Moreover, the radial scintillation values for the optimal N-beam configurations are found to be significantly smaller than the corresponding single beam values, and this reduction effect also grows with increasing N.

Paper Details

Date Published: 12 February 2007
PDF: 12 pages
Proc. SPIE 6457, Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves, 64570M (12 February 2007); doi: 10.1117/12.711187
Show Author Affiliations
A. Peleg, Univ. of Arizona (United States)
J. V. Moloney, Univ. of Arizona (United States)


Published in SPIE Proceedings Vol. 6457:
Free-Space Laser Communication Technologies XIX and Atmospheric Propagation of Electromagnetic Waves
Steve Mecherle; Olga Korotkova, Editor(s)

© SPIE. Terms of Use
Back to Top