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High-harmonic generation at 250 MHz with photon energies exceeding 100 eV

 
: Carstens, H.; Högner, M.; Saule, T.; Holzberger, S.; Lilienfein, N.; Guggenmos, A.; Jocher, C.; Eidam, T.; Esser, D.; Tosa, V.; Pervak, V.; Limpert, J.; Tünnermann, A.; Kleineberg, U.; Krausz, F.; Pupeza, I.

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Fulltext (PDF; )

Optica 3 (2016), No.4, pp.366-369
ISSN: 2334-2536
English
Journal Article, Electronic Publication
Fraunhofer ILT ()
Fraunhofer IOF ()

Abstract
Ultrafast spectroscopy in the extreme ultraviolet demands for ever-higher pulse repetition rates and photon energies. Here, we drive cavity-enhanced high-order harmonic generation (HHG) at a repetition rate of 250 MHz, with 30 fs pulses and an average power of 10 kW. Employing an optimized cavity geometry and a high-pressure gas target, we couple out nanowatt-level harmonics at photon energies around 100 eV. This constitutes an improvement of more than two orders of magnitude over previous megahertz-repetition-rate HHG experiments and paves the way toward high-photon-energy frequency-comb spectroscopy and toward pump-probe photoelectron microscopy and spectroscopy at unprecedented repetition rates.

: http://publica.fraunhofer.de/documents/N-391791.html