Open AccessPropagation of Gaussian Schell-model beams in modulated graded-index media
Author(s) -
S. A. Wadood,
Kevin Liang,
Govind P. Agrawal,
Taco D. Visser,
C. R. Stroud,
A. Nick Vamivakas
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.425921
Subject(s) - optics , physics , parametric statistics , gaussian , modulation (music) , coherence (philosophical gambling strategy) , modulation index , quantum mechanics , mathematics , pulse width modulation , acoustics , statistics , voltage
The evolution of partially coherent beams in longitudinally modulated graded-index media is studied. The special cases of Gaussian Schell-model beams and parametric modulation, when the modulation period is half the fiber self-imaging period, are examined in detail. We show that the widths of the intensity and coherence of Gaussian Schell-model beams undergo amplification in parametrically modulated parabolic graded-index media. The process is an analog of quantum mechanical parametric amplification and generation of squeezed states. Our work may find application in spatial and temporal imaging of partially coherent beams in fiber-based imaging systems.