An engineering approach to optical phase distortion through turbulent thermal boundary layers (original) (raw)

20th Fluid Dynamics, Plasma Dynamics and Lasers Conference, 1989

Abstract

This paper presents a two parameter model for assessing the degradiation in phase of a light beam traversing an incompressible turbulent thermal boundary layer. The model is intended for use by the 'thermal design engineer' to estimate the impact of the thermal design on beam quality. The model is based on the results of a series of numerical experiments performed using a modified version of a well-proven boundary-layer code. The modifications do not affect the fluid mechanics of the code, but rather, incorporated the theory, presented here, for extracting the pertinent parameters for performing optical phase distortion calculations. The paper demonstrates that when the code is exercised for a variety of configurations, the resulting phase degradation and subsequent reduced intensity in the far field are near similar solutions depending only on temperature difference between the surface and the free stream, and the momentum-boundary-layer thickness.

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