Propagation factor of a stochastic electromagnetic Gaussian Schell-model beam

Shijun Zhu, Yangjian Cai, Olga Korotkova

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

Analytical formula is derived for the propagation factor (known as M 2 -factor) of a stochastic electromagnetic Gaussian Schell-model (EGSM) beam in free space and in turbulent atmosphere. In free space, the M 2 -factor of an EGSM beam is mainly determined by its initial degree of polarization, r.ms. widths of the spectral densities and correlation coefficients, and its value remains invariant on propagation. In turbulent atmosphere, the M2 -factor of an EGSM beam is also determined by the parameters of the turbulent atmosphere, and its value increases on propagation. The relative M2 -factor of an EGSM beam with lower correlation factors, larger r.m.s. widths of the spectral densities and longer wavelength is less affected by the atmospheric turbulence. Under suitable conditions, an EGSM beam is less affected by the atmospheric turbulence than a scalar GSM beam (i.e. fully polarized GSM beam). Our results will be useful in long-distance free-space optical communications.

Original languageEnglish (US)
Pages (from-to)12587-12598
Number of pages12
JournalOptics Express
Volume18
Issue number12
DOIs
StatePublished - Jun 7 2010

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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