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Gas-filled hollow-core photonic crystal fibre (PCF) is being used to generateever wider supercontinuum spectra, in particular via dispersive wave (DW)emission in the deep and vacuum ultraviolet, with a multitude of applications.DWs are the result of the resonant transfer of energy from a self-compressedsoliton, a process which relies crucially on phase matching. It was recentlypredicted that, in the strong-field regime, the additional transient anomalousdispersion introduced by gas ionization would allow phase-matched DW generationin the mid-infrared (MIR)-something that is forbidden in the absence of freeelectrons. Here we report for the first time the experimental observation ofsuch MIR DWs, embedded in a 4.7-octave-wide supercontinuum that uniquelyreaches simultaneously to the vacuum ultraviolet, with up to 1.7 W of totalaverage power.

Novel mid-infrared dispersive wave generation in gas-filled PCF by transient ionization-driven changes in dispersion