title: Cavity-enhanced high-harmonic generation with spatially tailored driving fields.
abstract: We theoretically and experimentally investigate high-harmonic generation in a 78-MHz enhancement cavity with a transverse mode having on-axis intensity maxima at the focus and minima at an opening in the following mirror. We find that the conversion efficiency is comparable to that achievable with a Gaussian mode, whereas the output coupling efficiency can be significantly improved over any other demonstrated technique. This approach offers additional power scaling advantages and additional degrees of freedom in shaping the harmonic emission, paving the way to high-power extreme-ultraviolet frequency combs and the generation of multi-MHz repetition-rate-isolated attosecond pulses.
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Pupeza
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Högner
authors.affiliation: RWTH Aachen University, Lehrstuhl für Lasertechnik, Steinbachstraße 15, 52074 Aachen, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Weitenberg
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.
authors.forename: S
authors.initials: S
authors.lastname: Holzberger
authors.affiliation: Fraunhofer-Institut für Lasertechnik, Steinbachstraße 15, 52074 Aachen, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Esser
authors.affiliation: Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Straße 15, 07745 Jena, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Eidam
authors.affiliation: Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Straße 15, 07745 Jena, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Limpert
authors.affiliation: Friedrich-Schiller-Universität Jena, Institut für Angewandte Physik, Albert-Einstein-Straße 15, 07745 Jena, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Tünnermann
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.
authors.forename: E
authors.initials: E
authors.lastname: Fill
authors.affiliation: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany and Ludwig-Maximilians-Universität München, Am Coulombwall 1, 85748 Garching, Germany.
authors.forename: V S
authors.initials: VS
authors.lastname: Yakovlev