Abstract
We demonstrate broadband supercontinuum generation from 560 nm up to 2350 nm by coupling a simple Q-switched picosecond laser at 1064 nm into a normally dispersive step-index few-mode optical fiber designed to support five modes. It is further shown that multiple cascaded intermodal four-wave mixing and Raman processes occur in the fiber leading to the generation of new frequency components with far detuning up to 165 THz. The multimode properties of this fiber yield a number of intermodal nonlinear coupling terms, and we compare the generated parametric sideband wavelengths from the experiment with calculations from phase-matching conditions for intermodal four-wave mixing.
Highlights
The study of complex spatiotemporal dynamics of nonlinear light propagation in multimode optical fibers (MMFs) has recently witnessed renewed interest with the experimental demonstration of high-impact new phenomena in emerging key areas of laser physics and fiber optics.1,2 MMFs have been shown to possess specific modal properties that mediate a number of spatiotemporal nonlinear effects that are fundamentally different from those seen in standard single-mode fibers
We extend the study of novel nonlinear intermodal effects to step-index few-mode fibers (FMFs) to show that they can be conveniently applied to far-detuned cascaded intermodal fourwave mixing (FWM) and SC generation
We have reported in this work on the experimental generation of supercontinuum spanning two octaves from 560 to 2350 nm in a step-index few-mode fiber pumped with a Q-switched microchip laser at 1064 nm
Summary
The study of complex spatiotemporal dynamics of nonlinear light propagation in multimode optical fibers (MMFs) has recently witnessed renewed interest with the experimental demonstration of high-impact new phenomena in emerging key areas of laser physics and fiber optics.1,2 MMFs have been shown to possess specific modal properties that mediate a number of spatiotemporal nonlinear effects that are fundamentally different from those seen in standard single-mode fibers. It is further shown that multiple cascaded intermodal four-wave mixing and Raman processes occur in the fiber leading to the generation of new frequency components with far detuning up to 165 THz. The multimode properties of this fiber yield a number of intermodal nonlinear coupling terms, and we compare the generated parametric sideband wavelengths from the experiment with calculations from phase-matching conditions for intermodal four-wave mixing.
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