14 May 2018 Supercontinuum generation and intermodal four-wave mixing in a step-index few-mode fibre
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Abstract
We demonstrate broadband supercontinuum generation from 560 nm up to 2350 nm by coupling a Q-switched picosecond microchip laser at 1064 nm into a 15 μm-core step-index germanium-doped silica fiber, designed to support five spatial modes at 1064 nm. It is further shown that multiple cascaded intermodal four-wave mixing and Raman processes take place in the fiber with large frequency detuning up to 150 THz. The multimode properties of this fiber yield a number of intermodal nonlinear coupling terms and the parametric sideband wavelengths have been obtained from the phasematching condition for intermodal four-wave mixing.
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S. Perret, S. Perret, G. Fanjoux, G. Fanjoux, L. Bigot, L. Bigot, J. Fatome, J. Fatome, G. Millot, G. Millot, J. M. Dudley, J. M. Dudley, T. Sylvestre, T. Sylvestre, } "Supercontinuum generation and intermodal four-wave mixing in a step-index few-mode fibre ", Proc. SPIE 10684, Nonlinear Optics and its Applications 2018, 106841D (14 May 2018); doi: 10.1117/12.2305497; https://doi.org/10.1117/12.2305497
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