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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
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
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 [en]
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: urn:nbn:se:uu:diva-281298ISBN: 978-91-554-9528-2 (print)OAI: oai:DiVA.org:uu-281298DiVA: diva2:915355
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
List of papers
1. Spectroscopy in the vacuum-ultraviolet
Open this publication in new window or tab >>Spectroscopy in the vacuum-ultraviolet
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2011 (English)In: Nature Photonics, ISSN 1749-4885, Vol. 5, no 5, 248-248 p.Article in journal, Letter (Refereed) Published
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-153568 (URN)10.1038/nphoton.2011.58 (DOI)000290014900003 ()
Available from: 2011-05-16 Created: 2011-05-16 Last updated: 2016-04-29Bibliographically approved
2. Measuring the temporal coherence of a high harmonic generation setup employing a Fourier transform spectrometer for the VUV/XUV
Open this publication in new window or tab >>Measuring the temporal coherence of a high harmonic generation setup employing a Fourier transform spectrometer for the VUV/XUV
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2014 (English)In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 768, 84-88 p.Article in journal (Refereed) Published
Abstract [en]

In this experiment we used an 800 nm laser to generate high-order harmonics in a gas cell filled with Argon. Of those photons, a harmonic with 42 eV was selected by using a time-preserving grating monochromator. Employing a modified Mach–Zehnder type Fourier transform spectrometer for the VUV/XUV it was possible to measure the temporal coherence of the selected photons to about 6 fs. We demonstrated that not only could this kind of measurement be performed with a Fourier transform spectrometer, but also with some spatial resolution without modifying the XUV source or the spectrometer.

Place, publisher, year, edition, pages
Elsevier, 2014
Keyword
Fourier transform spectrometer, HHG, Temporal coherence, Spatial coherence, SoftX-ray, XUV
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-236322 (URN)10.1016/j.nima.2014.09.040 (DOI)000344995400013 ()
Funder
Swedish Research Council, 2006-4382Swedish Research Council, 2010-4132Swedish Research Council, 2011-5036Knut and Alice Wallenberg Foundation, 2008.0108Knut and Alice Wallenberg Foundation, personal grant (JS)Carl Tryggers foundation , 12:439Carl Tryggers foundation , 13:423
Available from: 2014-11-17 Created: 2014-11-17 Last updated: 2017-12-05Bibliographically approved
3. HELIOS-A laboratory based on high-order harmonic generation of extreme ultraviolet photons for time-resolved spectroscopy
Open this publication in new window or tab >>HELIOS-A laboratory based on high-order harmonic generation of extreme ultraviolet photons for time-resolved spectroscopy
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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.

National Category
Accelerator Physics and Instrumentation
Research subject
Physics
Identifiers
urn:nbn:se:uu:diva-168798 (URN)10.1063/1.4937463 (DOI)000368594900008 ()26724006 (PubMedID)
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
4. Direct measurement of excited electrons in a low bandgap polymer using XUV based time-resolved photoelectron spectroscopy
Open this publication in new window or tab >>Direct measurement of excited electrons in a low bandgap polymer using XUV based time-resolved photoelectron spectroscopy
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(English)In: Article in journal (Refereed) Submitted
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-281292 (URN)
Available from: 2016-03-22 Created: 2016-03-22 Last updated: 2016-04-29
5. A Setup for Element Specific Magnetization Dynamics using the Transverse Magneto-Optic Kerr Effect in the energy range of 35-70 eV
Open this publication in new window or tab >>A Setup for Element Specific Magnetization Dynamics using the Transverse Magneto-Optic Kerr Effect in the energy range of 35-70 eV
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(English)Manuscript (preprint) (Other academic)
National Category
Accelerator Physics and Instrumentation
Identifiers
urn:nbn:se:uu:diva-281296 (URN)
Available from: 2016-03-22 Created: 2016-03-22 Last updated: 2016-04-29

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