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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, Ferenc ORCID logoORCID: https://orcid.org/0000-0002-6525-9449 and Pupeza, I. (2016): High-harmonic generation at 250 MHz with photon energies exceeding 100 eV. In: Optica, Vol. 3, No. 4: pp. 366-369

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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. (C) 2016 Optical Society of America

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