Abstract
We observe efficient supercontinuum generation that extends into thevisible spectral range by pumping a low differential mode group delaygraded index multimode fiber in the normal dispersion regime. For a28.5 m long fiber, the generated spectrum spans more than two octaves,starting from below 450 nm and extending beyond 2400 nm. The mainnonlinear mechanisms contributing to the visible spectrum generationare attributed to multipath four-wave mixing processes and periodicspatio-temporal breathing dynamics. Moreover, by exploiting the highlymultimodal nature of this system, we demonstrate versatile generationof visible spectral peaks in shorter fiber spans by altering thelaunching conditions. A nonlinearly induced mode cleanup was alsoobserved at the pump wavelength. Our results could pave the way forhigh brightness, high power, and compact, multi-octave continuumsources.
© 2016 Optical Society ofAmerica
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