Different measures of speckle and coherence at the output of a multimode optical fiber

Efimov, Anatoly

doi:10.1364/JOSAA.36.000001

Title: Different measures of speckle and coherence at the output of a multimode optical fiber

Journal Article · Thu Dec 06 00:00:00 EST 2018 · Journal of the Optical Society of America. A, Optics, Image Science, and Vision

DOI:https://doi.org/10.1364/JOSAA.36.000001· OSTI ID:1571610

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Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Excitation of a multimode fiber with a focused spatially coherent light of finite bandwidth results in a partially coherent light at the output of the fiber. In this report, we observe the properties of speckle and classical coherence of such light with analytical theory, numerical modeling, and experimentally. Of particular interest is the relationship between measures of coherence and speckle and their dependence on input source bandwidth and fiber length. Speckle contrast is easy to measure experimentally and there exist at least two different methods to generate ensembles of random speckles. We demonstrate that speckle contrast evaluated over the ensemble of external diffusers is related to the number of effective modes—one of the characteristics of beam global coherence. The other speckle contrast measure evaluated over the ensemble of random bends and twists of the fiber is related to residual coherence, which is the pedestal on the average modulus of the complex degree of the coherence function on the output endface of the fiber.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; AC52-06NA25396

OSTI ID:: 1571610

Alternate ID(s):: OSTI ID: 1484401

Report Number(s):: LA-UR-18-27749; JOAOD6

Journal Information:: Journal of the Optical Society of America. A, Optics, Image Science, and Vision, Vol. 36, Issue 1; ISSN 1084-7529

Publisher:: Optical Society of America (OSA)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 7 works

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Effects of residual coherence on the scintillation of a partially coherent beam Efimov, Anatoly Optics Express, Vol. 27, Issue 19 https://doi.org/10.1364/oe.27.026874	journal	January 2019

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