Phase screens for nonturbulent optical inhomogeneities occurring in the upper troposphere and lower stratosphere

Demos T. Kyrazis

doi:10.1117/12.207006

17 April 1995 Phase screens for nonturbulent optical inhomogeneities occurring in the upper troposphere and lower stratosphere

Demos T. Kyrazis

Author Affiliations +

Proceedings Volume 2375, Beam Control, Diagnostics, Standards, and Propagation; (1995) https://doi.org/10.1117/12.207006
Event: Photonics West '95, 1995, San Jose, CA, United States

Abstract

Other fluid dynamic phenomena, in addition to isotropic turbulence, can produce index of refraction fluctuations within the atmosphere. The stratified conditions in the upper atmosphere lead to phenomena such as thin shear layers of the order of a few hundred meters thick and few tens of kilometers in horizontal extent, as well as gravity wave action. Because of the large scale associated with these phenomena, their effects are often dismissed in optical propagation calculations since the major optical effect is assumed to be tilt. Fluid dynamic modeling of the coherent structure within a shear layer has been carried out for a simulated altitude of 12 km. The outer scale associated with this coherent structure is shown to have a dominant effect on the index of refraction structure function even when Kolmogorov turbulence is present. The phase distortion resulting through propagation within the fluid density field is determined. Results of these calculations are presented as well as the effect of these phase distortions on the energy distribution in the focal plane.

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Demos T. Kyrazis "Phase screens for nonturbulent optical inhomogeneities occurring in the upper troposphere and lower stratosphere", Proc. SPIE 2375, Beam Control, Diagnostics, Standards, and Propagation, (17 April 1995); https://doi.org/10.1117/12.207006

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