Title

Moderate-Strong Theory Applied To Second Order Statistics

Keywords

Beam spreading; Mean intensity; Scintillation

Abstract

Recently, new theory governing laser beam scintillation was developed for all regimes of optical turbulence. This theory is based on the idea of a filter function that eliminates intermediate scale sizes that do not contribute to the refractive and diffractive effects of propagation. In this paper, by considering additional beam spreading due to atmospheric turbulence, we calculate the mean intensity (second order statistic) based on the spatial filter function and using the cut-offs previously determined in fourth order statistics. We compare the beam spreading (mean intensity) with previous results obtained via the standard Rytov approximation (weak fluctuations) and the Extended Huygens Fresnel Principle (strong fluctuations). It is found that in the absence of inner and outer scale effects the new theory based on the Kolmogorov spectrum modified with the spatial filter function actually under predicts both the previous Rytov and Extended Huygens' results. This leads us to the conclusion that the spatial frequency filter function approach developed for fourth order statistics is not valid for second order irradiance statistics.

Publication Date

8-8-2003

Publication Title

Proceedings of SPIE - The International Society for Optical Engineering

Volume

4976

Number of Pages

188-194

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1117/12.479208

Socpus ID

0043170783 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/0043170783

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