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Proceedings Article

Analysis of free-space laser signal intensity over a 2.33 km optical path

[+] Author Affiliations
Arnold Tunick

U.S. Army Research Lab.

Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 670802 (September 25, 2007); doi:10.1117/12.730958
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From Conference Volume 6708

  • Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation
  • Stephen M. Hammel; Alexander M. J. van Eijk; Michael T. Valley; Mikhail A. Vorontsov
  • San Diego, CA | August 26, 2007

abstract

The probability distribution of aperture averaged signal intensity from free-space laser optical systems depends on the optical turbulence along the optical path. For most current free-space laser systems, random fluctuations of signal intensity are assumed to be statistically homogeneous and isotropic. Moreover, it is assumed that probability distributions are generally log-normal and that Kolmogorov -5/3 wave number turbulence power law represents the signal intensity data. In this paper, the Kolmogorov model is investigated for an optical path that traverses a complex non-uniform topography. Experimental research is conducted to determine the characteristic behavior of high frequency (2000 Hz) signal intensity data collected over a 2.33 km optical path at the Army Research Laboratory (ARL) Atmospheric Laser Optics Testbed (A_LOT) Facility. Results focus mainly on calculated power spectra and frequency distributions. In addition, a model is developed to calculate optical turbulence intensity (C2/n) as a function of receiving (and transmitting) aperture diameter, log-amplitude variance, and path length. Here, initial comparisons of calculated to measured C2/n data are favorable. It is anticipated that this kind of signal data analysis will benefit laser communication systems development and testing at the ARL.

© (2007) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Arnold Tunick
"Analysis of free-space laser signal intensity over a 2.33 km optical path", Proc. SPIE 6708, Atmospheric Optics: Models, Measurements, and Target-in-the-Loop Propagation, 670802 (September 25, 2007); doi:10.1117/12.730958; http://dx.doi.org/10.1117/12.730958


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