Intensity Distribution and Coherence Characteristics of Partially
Coherent Light in Horizontal Atmospheric Propagation

Abstract

Abstract: The expressions of intensity distribution and coherent length of partially coherent light are obtained by
using the cross spectral density function of the beam. Based on the expressions, the effects of different coherent
parameters of light source and different turbulence intensity on the intensity distribution and coherent length of
partially coherent light in horizontal atmosphere are numerically simulated and compared with that of completely
coherent light. The results show that, in the process of free space transmission, the light intensity distribution is
mainly affected by the broadening caused by diffraction, and the larger the coherent parameter of light source is, the
larger the coherent length of light beam is. While in the turbulent atmosphere, the larger the coherent parameters
of light source is, the smaller the influence of the intensity of turbulent atmosphere on the intensity distribution
and coherent length of light is. And with the increase of turbulence intensity and propagation distance, the beam
broadening effect increases, and the coherent length of the beam decreases at the same time due to the turbulence
superposition effect.

Key words: partially coherent light, atmospheric turbulence, intensity distribution, coherence length, horizontal propagation

CLC Number:

TN24
P425

References

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Intensity Distribution and Coherence Characteristics of Partially Coherent Light in Horizontal Atmospheric Propagation

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