title: Bright subcycle extreme ultraviolet bursts from a single dense relativistic electron sheet.
abstract: Double-foil targets separated by a low density plasma and irradiated by a petawatt-class laser are shown to be a copious source of coherent broadband radiation. Simulations show that a dense sheet of relativistic electrons is formed during the interaction of the laser with the tenuous plasma between the two foils. The coherent motion of the electron sheet as it transits the second foil results in strong broadband emission in the extreme ultraviolet, consistent with our experimental observations.
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-University, Am Coulombwall 1, D-85748 Garching, Germany.
authors.forename: W J
authors.initials: WJ
authors.lastname: Ma
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-University, Am Coulombwall 1, D-85748 Garching, Germany and Max-Planck-Institute of Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: J H
authors.initials: JH
authors.lastname: Bin
authors.affiliation: Max-Planck-Institute of Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany and State Key Laboratory of Nuclear Physics and Technology & Center of Applied Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: H Y
authors.initials: HY
authors.lastname: Wang
authors.affiliation: Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom and Helmholtz Institute Jena, 07743 Jena, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Yeung
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-University, Am Coulombwall 1, D-85748 Garching, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Kreuzer
authors.affiliation: Blackett Laboratory, Imperial College London, London SW7 2AZ, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Streeter
authors.affiliation: Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom and Central Laser Facility, STFC Rutherford Appleton Laboratory, Chilton, Didcot OX11 0QX, United Kingdom.
authors.forename: P S
authors.initials: PS
authors.lastname: Foster
authors.affiliation: Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom.
authors.forename: S
authors.initials: S
authors.lastname: Cousens
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-University, Am Coulombwall 1, D-85748 Garching, Germany.
authors.forename: D
authors.initials: D
authors.lastname: Kiefer
authors.affiliation: Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom.
authors.forename: B
authors.initials: B
authors.lastname: Dromey
authors.affiliation: State Key Laboratory of Nuclear Physics and Technology & Center of Applied Physics and Technology, Peking University, Beijing 100871, China.
authors.forename: X Q
authors.initials: XQ
authors.lastname: Yan
authors.affiliation: Max-Planck-Institute of Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Meyer-ter-Vehn
authors.affiliation: Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN, United Kingdom and Helmholtz Institute Jena, 07743 Jena, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Zepf
authors.affiliation: Fakultät für Physik, Ludwig-Maximilians-University, Am Coulombwall 1, D-85748 Garching, Germany and Max-Planck-Institute of Quantum Optics, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany.
authors.forename: J
authors.initials: J
authors.lastname: Schreiber