Title

Turbulence induced beam spreading of higher order mode optical waves

Authors

Authors

C. Y. Young; Y. V. Gilchrest;B. R. Macon

Comments

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Abbreviated Journal Title

Opt. Eng.

Keywords

beam spreading; optical waves; Gaussian beams; atmospheric turbulence; GAUSSIAN BEAMS; SPOT SIZE; DIVERGENCE; Optics

Abstract

It is well known that laser beams spread as they propagate through free space due to natural diffraction, and that there is additional spreading when optical waves propagate through atmospheric turbulence. Previous studies on Gaussian beams have mainly involved the lowest order mode (zero order). The study of higher order mode Gaussian beams has involved Hermite-Gaussian and Laguerre-Gaussian beams for rectangular and cylindrical geometry, respectively, These studies have developed expressions for the field and intensity in free space, in addition to developing new definitions of beam size in the receiver plane for the higher order modes. We calculate the mean intensity of higher order mode Gaussian beams propagating through atmospheric turbulence, and, based on previously developed definitions for beam radius, we calculate the additional beam spreading due to random media. It is shown that higher order mode Gaussian beams experience less percentage of additional broadening due to atmospheric fluctuations than the zero-order mode beams. (C) 2002 Society of Photo-Optical Instrumentation Engineers.

Journal Title

Optical Engineering

Volume

41

Issue/Number

5

Publication Date

1-1-2002

Document Type

Article

Language

English

First Page

1097

Last Page

1103

WOS Identifier

WOS:000175583500028

ISSN

0091-3286

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