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Ultrafast supercontinuum generation in gas-filled waveguides is one enablingtechnology for many intriguing application ranging from attosecond metrologytowards biophotonics, with the amount of spectral broadening cruciallydepending on the pulse dispersion of the propagating mode. Here we show thatthe structural resonances in gas-filled anti-resonant hollow core optical fiberprovide an additional degree of freedom in dispersion engineering, allowing forthe generation of more than three octaves of broadband light ranging deep UVwavelength towards the near infrared.Our observation relies on the introductionof a geometric-induced resonance in the spectral vicinity of the pump laseroutperforming the gas dispersion, thus yielding a dispersion being independentof core size, which is highly relevant for scaling input powers.Using a Kryptonfilled fiber we observe spectral broadening from 200 nm towards 1.7 \mu m at anoutput energy of about 23 \mu J within a single mode across the entire spectralbandwidth. Simulations show that the efficient frequency generation resultsfrom a new physical effect the soliton explosion originating from the stronglynon-adiabatic mode dispersion profile.This effect alongside with the dispersiontuning capability of the fiber will enable compact ultrabroadband high energysources spanning from the UV to the mid-infrared spectral range.

Soliton explosion driven multi-octave supercontinuum generation by geometry-enforced dispersion design in antiresonant hollow-core fibers