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Atmospheric inner-scale effects on normalized irradiance variance.

C A Davis, D L Walters

|October 22, 2010

Summary

This summary is machine-generated.

Investigating atmospheric optical turbulence inner scales, this study found that different inner scale models impact laser irradiance variance. Results show viscous-convective scales initially increase then decrease variance, affecting laser propagation.

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Area of Science:

Atmospheric optics
Laser physics
Turbulence theory

Background:

Atmospheric optical turbulence significantly affects laser beam propagation.
Understanding the inner scale's role is crucial for accurate modeling.

Purpose of the Study:

To investigate the impact of five distinct atmospheric optical turbulence inner scale models on normalized laser irradiance variance.
To compare simulation results with Rytov-Tatarskii predictions.

Main Methods:

Wave-optics computer simulations were employed.
Five types of inner scales were analyzed: zero, Gaussian, Hill's viscous-convective, Frehlich's parameterization, and spectrum truncation.
Simulations were conducted in Rytov and early saturation regimes.

Main Results:

Simulations closely matched numerical integrations of Rytov-Tatarskii predictions (within 2%).
In the Rytov regime, Gaussian inner scales reduced variance, while viscous-convective scales showed a non-monotonic effect.
In the saturation regime, all inner scale models increased intensity variance for spherical waves.

Conclusions:

The choice of inner scale model significantly influences normalized laser irradiance variance.
Accurate modeling of inner scales is essential for predicting laser propagation through atmospheric turbulence.
Wave-optics simulations provide a reliable method for studying these effects.