Simple Model for Spatial Coherence of Light at the Output of a Multimode Fiber

A model for the spatial coherence function of a partially coherent light produced at the output of a step-index multimode fiber excited with a spatially coherent broadband source is developed. The field is represented as a sum of coherent and partially coherent parts, the former being a fully develo...

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Bibliographic Details
Published in:Journal of lightwave technology 2019-11, Vol.37 (22), p.5647-5651
Main Author: Efimov, Anatoly
Format: Article
Language:English
Subjects:
Apertures
Bandwidth
Broadband
Coherence
Coherent light
Coordinate measuring machines
Dispersion
Effective number of modes
ENGINEERING
global degree of coherence
multimode fiber
partially coherent beam
Spatial coherence
Speckle
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Summary:A model for the spatial coherence function of a partially coherent light produced at the output of a step-index multimode fiber excited with a spatially coherent broadband source is developed. The field is represented as a sum of coherent and partially coherent parts, the former being a fully developed speckle and the latter is described by a "Jinc" degree of coherence and uniform intensity over the core of the fiber. The model correctly describes all available experimental data, including global degree of coherence, and is intuitive and simple.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2019.2915788