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 Karl Franzens University Graz

Graz University of Technology 

- Gas-based nonlinear optics in hollow-core fibres: ultrafast dynamics & applications
Francesco Tani
Max Planck Institute for the Science of Light
16:15 - 17:15 Tuesday 22 March 2022 TUG hybrid event: lecture hall P2 / Webex

Video: https://tugraz.webex.com/tugraz/j.php?MTID=me6a77c77bcae8cc0a3f302a7e8540e64

Soliton dynamics in gas-filled hollow-core waveguides have brought together nonlinear fibre optics and high field laser science providing new powerful tools for manipulating ultrashort light pulses and an access door to novel nonlinear dynamics. The broadband transmission, the weakly anomalous dispersion and the high-damage threshold of hollow-core fibres grant excellent control over the interplay between linear and nonlinear effects. This allows for the harnessing of pulse propagation dynamics to realise novel light sources with up to PHz bandwidths and in spectral regions otherwise not easily accessible. Furthermore, the high efficiency and the low-pulse energy requirements of these processes facilitate the scaling of these sources to unprecedently high repetition rates.
In this talk, I will introduce the properties of gas-filled fibres and pulse propagation dynamics in such systems. I will then discuss photoionisation induced long-lived dynamics and their effects. Finally, I will discuss scale invariance of many nonlinear processes and report recent works on the generation of µJ-level, few fs pulses at MHz repetitions rates in the infrared and ultraviolet spectral regions.