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HELIOS-A laboratory based on high-order harmonic generation of extreme ultraviolet photons for time-resolved spectroscopy
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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2015 (English)In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 86, no 12, 123107Article in journal (Refereed) Published
Abstract [en]

In this paper, we present the HELIOS (High Energy Laser Induced Overtone Source) laboratory, an in-house high-order harmonic generation facility which generates extreme ultraviolet (XUV) photon pulses in the range of 15-70 eV with monochromatized XUV pulse lengths below 35 fs. HELIOS is a source for time-resolved pump-probe/two-color spectroscopy in the sub-50 fs range, which can be operated at 5 kHz or 10 kHz. An optical parametric amplifier is available for pump-probe experiments with wavelengths ranging from 240 nm to 20 000 nm. The produced XUV radiation is monochromatized by a grating in the so-called off-plane mount. Together with overall design parameters, first monochromatized spectra are shown with an intensity of 2 . 10(10) photons/s (at 5 kHz) in the 29th harmonic, after the monochromator. The XUV pulse duration is measured to be <25 fs after monochromatization.

Place, publisher, year, edition, pages
2015. Vol. 86, no 12, 123107
National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
URN: urn:nbn:se:uu:diva-168798DOI: 10.1063/1.4937463ISI: 000368594900008PubMedID: 26724006OAI: oai:DiVA.org:uu-168798DiVA: diva2:503358
Funder
Knut and Alice Wallenberg FoundationKnut and Alice Wallenberg FoundationCarl Tryggers foundation Swedish Research Council
Note

De två första författarna delar förstaförfattarskapet.

Available from: 2012-02-15 Created: 2012-02-15 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Techniques and Application of Electron Spectroscopy Based on Novel X-ray Sources
Open this publication in new window or tab >>Techniques and Application of Electron Spectroscopy Based on Novel X-ray Sources
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The curiosity of researchers to find novel characteristics and properties of matter constantly pushes for the development of instrumentation based on X-radiation. I present in this thesis techniques for electron spectroscopy based on developments of X-ray sources both in time structure and energy. One part describes a laser driven High-Harmonic Generation source and the application of an off-plane grating monochromator with additional beamlines and spectrometers. In initial experiments, the source is capable of producing harmonics between the 13th and 23rd of the fundamental laser 800 nm wavelength. The intensity in the 19th harmonic, after monochromatization, was measured to be above 1.2·1010 photons/second with a repetition rate of 5 kHz. 

The development of a chopper system synchronized to the bunch clock of an electron storage ring is also presented. The system can be used to adjust the repetition rate of a synchrotron radiation beam to values between 10 and 120 kHz, or for the modulation of continuous sources. The application of the system to both time of flight spectroscopy and laser pump X-ray probe spectroscopy is shown. It was possible to measure triple ionization of Kr and in applied studies the valence band of a laser excited dye-sensitized solar cell interface. The combination of the latter technique with transient absorption measurements is proposed.

The organic molecule maleic anhydride (MA) and its binding configuration to the three anatase TiO2 crystals (101), (100), (001) has been investigated by means of Xray Photoelectron Spectroscopy (XPS) and Near Edge X-ray Absorption Fine structure Spectroscopy (NEXAFS). The results provide information on the binding configuration to the 101 crystal. High Kinetic Energy Photoelectron Spectroscopy was used to investigate multilayers of complexes of iron, ruthenium and osmium. The benefit of hard X-rays for ex-situ prepared samples is demonstrated together with the application of resonant valence band measurements to these molecules.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2012. 53 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 903
Keyword
High Harmonic Generation HHG, HELIOS, X-ray Beam Chopper, Dye-sensitized Solar Cell, Ultra High Vacuum UHV, Photoelectron Spectroscopy, Pump-Probe, XUV
National Category
Physical Sciences
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-168799 (URN)978-91-554-8283-1 (ISBN)
Public defence
2012-03-30, Pol/1311, Polacksbacken, Lägerhyddsvägen 2, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2012-03-09 Created: 2012-02-15 Last updated: 2012-09-18Bibliographically approved
2. Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution: The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy
Open this publication in new window or tab >>Constructing and Commissioning HELIOS – A High Harmonic Generation Source for Pump-Probe Measurements with sub 50 fs Temporal Resolution: The Development of Experimental Equipment for Extreme Ultraviolet Spectroscopy
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis presents HELIOS, an in-house laboratory for time-resolved pump-probe spectroscopy with extreme-ultraviolet (XUV) probe radiation. A wide span of pump wavelengths can be generated using commercial laser equipment while XUV probe radiation is generated via a high harmonic generation process in a noble gas delivering probe photons with energies between 20 eV and 72 eV. The XUV beam path features a time-preserving monochromator and was constructed and built in-house. HELIOS features an overall time resolution of about 50 fs when using 800 nm pump and 41 eV probe photons. An energy resolution of 110 meV at 41 eV photon energy can be achieved. HELIOS features two beamlines. One µ-focus beamline with an XUV focal size of about 20 µm can be used with experiments that require such a small XUV focal size as well as with different end stations. The other beamline features a semi-permanently mounted end station for angle-resolved photoelectron spectroscopy under ultra-high vacuum conditions.

Experiments demonstrating the usability of HELIOS and the two beamlines are presented. A pump-probe measurement on graphene demonstrates the capability of determining a large part of the k-space in only one measurement due to the use of an ARTOF angle-resolved time-of-flight electron spectrometer. A non-angle-resolved pump-probe measurement on the conducting polymer PCPDTBT demonstrates the high signal-to-noise ratio achievable at this beamline in non-angle-resolved photoelectron-spectroscopy pump-probe measurements. The usability of the µ-focus beamline is demonstrated with time-resolved measurements on magnetic samples employing an in-house-designed spectrometer. These experiments allow the retrieval of element-specific information on the magnetization within a sample employing the transversal magneto-optical Kerr effect (T-MOKE).

Additionally, a Fourier transform spectrometer for the XUV is presented, the concept was tested at a synchrotron and it was used to determine the longitudinal coherence of the XUV radiation at HELIOS.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2016. 80 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1360
Keyword
Angle-resolved photoemission spectroscopy, Angle resolved photoemission spectroscopy, Angle-resolved time-of-flight, Angle resolved time of flight, ARTOF, ARPES, tr-ARPES, fs, fs resolution, Fourier transform spectrometer, Fourier-transform spectrometer, Fourier transform spectroscopy, Fourier-transform spectroscopy, FTS, gas cell, high harmonic generation, laser, liquid jet, monochromator, HELIOS, HHG, off-plane mount, off plane mount, OPA, optical parametric amplifier, PCPDTBT, pulse shaping, pump probe, pump-probe measurements, pump-probe measurements, pump-probe spectroscopy, pump-probe spectroscopy, Rowland spectrometer, time-of-flight spectrometer, time of flight spectrometer, TOF, time-resolved spectroscopy, time resolved spectroscopy, time-resolved experiments, time resolved experiments, T-MOKE, tr-PES, PES, photoelectron spectroscopy, transverse magneto optical Kerr effect, transverse magneto-optical Kerr effect, ultrafast, ultra-high vacuum, ultra high vacuum, UHV, XUV, VUV, X-rays, Permalloy, magnetization dynamic
National Category
Accelerator Physics and Instrumentation Atom and Molecular Physics and Optics
Research subject
Physics with spec. in Atomic, Molecular and Condensed Matter Physics
Identifiers
urn:nbn:se:uu:diva-281298 (URN)978-91-554-9528-2 (ISBN)
Public defence
2016-05-17, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2016-04-26 Created: 2016-03-22 Last updated: 2016-04-29

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Terschlüsen, Joachim A.Cappel, Ute B.Rubensson, Jan-ErikSiegbahn, HansSöderström, Johan

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