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J Opt Soc Am A Opt Image Sci Vis. 2015 Oct 1;32(10):1848-56. doi: 10.1364/JOSAA.32.001848.

General Rytov approximation.

Abstract

We examine how the Rytov approximation describing log-amplitude and phase fluctuations of a wave propagating through weak uniform turbulence can be generalized to the case of turbulence with a large-scale nonuniform component. We show how the large-scale refractive index field creates Fermat rays using the path integral formulation for paraxial propagation. We then show how the second-order derivatives of the Fermat ray action affect the Rytov approximation, and we discuss how a numerical algorithm would model the general Rytov approximation.

PMID:
26479938
DOI:
10.1364/JOSAA.32.001848

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