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Path-averaged Cn2 estimation using a laser-and-corner-cube system.

Walter P Cole1, Michael A Marciniak

  • 1Air Force Institute of Technology, Department of Engineering Physics, Wright-Patterson Air Force Base, Ohio 45433, USA. walter.p.cole@us.army.mil

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Summary
This summary is machine-generated.

Researchers developed a method to estimate atmospheric turbulence (Cn2) using laser beam spread and return power. This technique, validated with near-infrared lasers, accurately measures turbulence along near-ground paths.

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Area of Science:

  • Atmospheric optics
  • Laser physics
  • Optical remote sensing

Background:

  • Laser beam propagation is affected by atmospheric turbulence, causing beam spread.
  • Accurate measurement of atmospheric turbulence, quantified by the refractive-index structure parameter (Cn2), is crucial for optical systems.
  • Existing methods may have limitations in various turbulence regimes.

Purpose of the Study:

  • To establish a relationship between atmospheric beam spread, return power, and Cn2.
  • To develop and describe a technique for estimating path-averaged Cn2 using a laser system.
  • To validate the technique experimentally.

Main Methods:

  • Utilized turbulence theory applicable to both weak and strong optical turbulence.
  • Developed a theoretical model linking beam spread and return power to Cn2.
  • Employed a laser-and-corner-cube system for Cn2 estimation.
  • Conducted experiments using near-infrared laser wavelengths.

Main Results:

  • A quantifiable relationship between beam spread, return power, and Cn2 was established.
  • The laser-and-corner-cube system successfully estimated path-averaged Cn2.
  • Experimental results showed good agreement with theoretical predictions.
  • Measurements were validated against scintillometer-derived Cn2 values.

Conclusions:

  • The described technique provides a reliable method for estimating path-averaged Cn2.
  • The findings are applicable to near-ground, line-of-sight propagation paths.
  • This method advances the understanding and measurement of atmospheric turbulence effects on laser beams.