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Resonance-enhanced multi-octave supercontinuum generation in antiresonant hollow-core fibers.

Sollapur, Rudrakant; Kartashov, Daniil; Zürch, Michael; Hoffmann, Andreas; Grigorova, Teodora; Sauer, Gregor; Hartung, Alexander; Schwuchow, Anka; Bierlich, Jörg; Kobelke, Jens; Chemnitz, Mario; Schmidt, Heidemarie; Spielmann, Christian
in: Light-Science & Applications (2017) e17124

Ultrafast supercontinuum generation in gas-filled waveguides is one enabling technology for many intriguing application ranging from attosecond metrology towards biophotonics, with theamount of spectral broadening crucially depending on the pulse dispersion of the propagatingmode. Here we show that the structural resonances in gas-filled anti-resonant hollow coreoptical fiber provide an additional degree of freedom in dispersion engineering, allowing for the generation of more than three octaves of broadband light ranging deep UV wavelength towards the near infrared. Our observation relies on the introduction of a geometric-induced resonance in the spectral vicinity of the pump laser outperforming the gas dispersion, thus yielding adispersion being independent of core size, which is highly relevant for scaling input powers.Using a Krypton filled fiber we observe spectral broadening from 200 nm towards 1.7 μm at anoutput energy of about 23 μJ within a single mode across the entire spectral bandwidth.Simulations show that the efficient frequency generation results from a new physical effect –the soliton explosion – originating from the strongly non-adiabatic mode dispersion profile. This effect alongside with the dispersion tuning capability of the fiber will enable compactultrabroadband high energy sources spanning from the UV to the mid-infrared spectral range.

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