Inter-pulse dynamics at high repetition rates by femtosecond ionization in gas-filled fibres

Köttig F, Koehler JR, Tani F, Russell PSJ (2019)

Publication Type: Conference contribution

Publication year: 2019

Publisher: Institute of Electrical and Electronics Engineers Inc.

Conference Proceedings Title: 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019

Event location: Munich, DEU

ISBN: 9781728104690

DOI: 10.1109/CLEOE-EQEC.2019.8872301

Abstract

Nonlinear propagation of intense ultrashort laser pulses in gases is mostly understood to be influenced only by the pulse itself, i.e., by single-shot dynamics, because relaxation processes are typically faster than the time between pulses. Using single-ring hollow-core photonic crystal fibre (PCF) [1], strong-field intensities can be reached by μ-level pulses, available from MHz-level repetition rate fibre lasers. At these high repetition rates it is not clear that pulse-to-pulse interactions can still be neglected. Indeed, experiments involving photoionization show a strong repetition rate-dependence, suggesting that the pulse dynamics are influenced by inter-pulse effects [1]. Recently it has been shown, using interferometric side-probing [2], that fs photoionization and subsequent recombination-induced heating leads to a drop in refractive index tens of μs long, caused by a gas density depression in the core after an acoustic shock wave has propagated away. Here we report that this modifies the characteristics of the fibre, influencing pulse propagation even at 100 kHz repetition rate.

Authors with CRIS profile

Philip St. John Russell Lehrstuhl für Experimentalphysik (Alfried Krupp von Bohlen und Halbach-Professur)

Involved external institutions

Max-Planck-Institut für die Physik des Lichts (MPL) / Max Planck Institute for the Science of Light DE Germany (DE)

How to cite

APA:

Köttig, F., Koehler, J.R., Tani, F., & Russell, P.S.J. (2019). Inter-pulse dynamics at high repetition rates by femtosecond ionization in gas-filled fibres. In 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019. Munich, DEU: Institute of Electrical and Electronics Engineers Inc..

MLA:

Köttig, Felix, et al. "Inter-pulse dynamics at high repetition rates by femtosecond ionization in gas-filled fibres." Proceedings of the 2019 Conference on Lasers and Electro-Optics Europe and European Quantum Electronics Conference, CLEO/Europe-EQEC 2019, Munich, DEU Institute of Electrical and Electronics Engineers Inc., 2019.

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