## Scintillation index for two Gaussian laser beams with different wavelengths in weak atmospheric turbulence

JOSA A, Vol. 23, Issue 12, pp. 3114-3122 (2006)

http://dx.doi.org/10.1364/JOSAA.23.003114

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### Abstract

We study the propagation of the two lowest-order Gaussian laser beams with different wavelengths in weak atmospheric turbulence. Using the Rytov approximation and assuming a slow detector, we calculate the longitudinal and radial components of the scintillation index for a typical free-space laser communication setup. We find the optimal configuration of the two laser beams with respect to the longitudinal scintillation index. We show that the value of the longitudinal scintillation for the optimal two-beam configuration is smaller by more than 50% compared with the value for a single lowest-order Gaussian beam with the same total power. Furthermore, the radial scintillation for the optimal two-beam system is smaller by 35%–40% compared with the radial scintillation in the single-beam case. Further insight into the reduction of intensity fluctuations is gained by analyzing the self- and cross-intensity contributions to the scintillation index.

© 2006 Optical Society of America

**OCIS Codes**

(010.1300) Atmospheric and oceanic optics : Atmospheric propagation

(010.1330) Atmospheric and oceanic optics : Atmospheric turbulence

(010.3310) Atmospheric and oceanic optics : Laser beam transmission

(030.7060) Coherence and statistical optics : Turbulence

(060.4510) Fiber optics and optical communications : Optical communications

**ToC Category:**

Atmospheric and Oceanic Optics

**History**

Original Manuscript: March 14, 2006

Manuscript Accepted: June 23, 2006

**Citation**

Avner Peleg and Jerome V. Moloney, "Scintillation index for two Gaussian laser beams with different wavelengths in weak atmospheric turbulence," J. Opt. Soc. Am. A **23**, 3114-3122 (2006)

http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-23-12-3114

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