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Coherence characterization of partially coherent flat-topped beam propagating through atmospheric turbulence

Kashani F. D., Alavinejad M., Ghafary B.

Optica Applicata

2009

Vol. 39, nr 2

429-440

We study the change in the degree of coherence of a partially coherent flat-topped (PCFT) beam propagating through atmospheric turbulence. It is shown analytically that with a fixed set of source parameters and under a particular atmospheric turbulence model, a PCFT beam propagating through atmospheric turbulence reaches its maximum value of coherence after propagating a particular distance, and the effective width of the spectral degree of coherence also has its maximum value. This phenomenon is independent of the turbulence model used. We also study the effects of beam width values, the structure constant of turbulent media and the degree of coherence on effective width of spectral degree of coherence. The results are illustrated by numerically calculated curves.

Propagation properties of partially coherent beams through turbulent media with coherent modes representation

Alavinejad M., Ashiri F., Ghafary B.

Optica Applicata

2008

Vol. 38, nr 3

549-558

The partially coherent beams propagating through turbulent atmosphere have been studied in the past using coherent mode representation. In this research, the propagation of any modes of Hermite-Gaussian beam in a turbulent atmosphere is investigated and analytical formula for the average intensity of these beams is derived. The power in bucket (PIB) for any modes is also examined. The number of modes which exist in a partially coherent beam with known degree of global coherence (ratio of correlation length and the waist width of the Gaussian-Schell model (GSM) beam) is determined and the PIB for partially coherent beams is investigated using coherent mode representation.