title: New design of a multi-jet target for quasi phase matching.
abstract: An improved dual-gas quasi-phase matching (QPM) foil target for high harmonic generation (HHG) is presented. The target can be setup with 12 individual gas inlets each feeding multiple nozzles separated by a minimum distance of 10 μm. Three-dimensional gas density profiles of these jets were measured using a Mach-Zehnder Interferometer. These measurements reveal how the jets influence the density of gas in adjacent jets and how this leads to increased local gas densities. The analysis shows that the gas profiles of the jets are well defined up to a distance of about 300 μm from the orifice. This target design offers experimental flexibility, not only for HHG/QPM investigations, but also for a wide range of experiments due to the large number of possible jet configurations. We demonstrate the application to controlled phase tuning in the extreme ultraviolet using a 1 kHz-10 mJ-30 fs-laser system where interference between two jets in the spectral range from 17 to 30 nm was observed.
authors.affiliation: Deutsches Elektronensynchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Hage
authors.affiliation: Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: B
authors.initials: B
authors.lastname: Landgraf
authors.affiliation: School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Taylor
authors.affiliation: Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Wünsche
authors.affiliation: Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Gangolf
authors.affiliation: Deutsches Elektronensynchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: H
authors.initials: H
authors.lastname: Höppner
authors.affiliation: Helmholtzinstitut Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: M J
authors.initials: MJ
authors.lastname: Prandolini
authors.affiliation: Helmholtzinstitut Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Riedel
authors.affiliation: Deutsches Elektronensynchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: M
authors.initials: M
authors.lastname: Schulz
authors.affiliation: Helmholtzinstitut Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Tavella
authors.affiliation: Deutsches Elektronensynchrotron (DESY), Notkestrasse 85, 22607 Hamburg, Germany.
authors.forename: A
authors.initials: A
authors.lastname: Willner
authors.affiliation: School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Yeung
authors.affiliation: Institute of Optics and Quantum Electronics, Abbe Center of Photonics, Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena, Germany.
authors.forename: G G
authors.initials: GG
authors.lastname: Paulus
authors.affiliation: Helmholtzinstitut Jena, Helmholtzweg 4, 07743 Jena, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Spielmann
authors.affiliation: School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, United Kingdom.
authors.forename: B
authors.initials: B
authors.lastname: Dromey
authors.affiliation: School of Mathematics and Physics, Queen's University, University Road, Belfast BT7 1NN, United Kingdom.
authors.forename: M
authors.initials: M
authors.lastname: Zepf