umu.sePublications
Change search
Link to record
Permanent link

Direct link
BETA
Alternative names
Publications (10 of 31) Show all publications
Smijesh, N., Zhang, X., Fischer, P., Muschet, A., Salh, R., Tajalli, A., . . . Veisz, L. (2019). Contrast improvement of sub-4 fs laser pulses using nonlinear elliptical polarization rotation. Optics Letters, 44(16), 4028-4031
Open this publication in new window or tab >>Contrast improvement of sub-4 fs laser pulses using nonlinear elliptical polarization rotation
Show others...
2019 (English)In: Optics Letters, ISSN 0146-9592, E-ISSN 1539-4794, Vol. 44, no 16, p. 4028-4031Article in journal (Refereed) Published
Abstract [en]

Temporal-intensity contrast is crucial in intense laser-matter interaction to circumvent the undesirable expansion of steep high-density plasma prior to the interaction with the main pulse. Nonlinear elliptical polarization rotation in an argon filled hollow-core fiber is used here for cleaning pedestals/satellite pulses of a chirped-pulse-amplifier based Ti: Sapphire laser. This source provides similar to 35 mu J energy and sub-4-fs duration, and the process has >50% internal efficiency, more than the most commonly used pulse cleaning methods. Further, the contrast is improved by 3 orders of magnitude when measured after amplifying the pulses to 16 TW using non-collinear optical parametric chirped pulse amplification with a prospect to even further enhancement.

Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-162848 (URN)10.1364/OL.44.004028 (DOI)000481541400031 ()31415539 (PubMedID)
Available from: 2019-09-09 Created: 2019-09-09 Last updated: 2019-09-09Bibliographically approved
Wenz, J., Döpp, A., Khrennikov, K., Schindler, S., Gilljohann, M. F., Ding, H., . . . Karsch, S. (2019). Dual-energy electron beams from a compact laser-driven accelerator. Nature Photonics, 13, 263-269
Open this publication in new window or tab >>Dual-energy electron beams from a compact laser-driven accelerator
Show others...
2019 (English)In: Nature Photonics, ISSN 1749-4885, E-ISSN 1749-4893, Vol. 13, p. 263-269Article in journal (Refereed) Published
Abstract [en]

Ultrafast pump–probe experiments open the possibility to track fundamental material behaviour, such as changes in electronic configuration, in real time. To date, most of these experiments are performed using an electron or a high-energy photon beam that is synchronized to an infrared laser pulse. Entirely new opportunities can be explored if not only a single, but multiple synchronized, ultrashort, high-energy beams are used. However, this requires advanced radiation sources that are capable of producing dual-energy electron beams, for example. Here, we demonstrate simultaneous generation of twin-electron beams from a single compact laser wakefield accelerator. The energy of each beam can be individually adjusted over a wide range and our analysis shows that the bunch lengths and their delay inherently amount to femtoseconds. Our proof-of-concept results demonstrate an elegant way to perform multi-beam experiments in the future on a laboratory scale.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-157501 (URN)10.1038/s41566-019-0356-z (DOI)000462042800016 ()
Funder
Swedish Research Council, 2016-05409
Available from: 2019-03-25 Created: 2019-03-25 Last updated: 2019-08-21Bibliographically approved
Leshchenko, V. E., Kessel, A., Jahn, O., Krüger, M., Münzer, A., Trushin, S. A., . . . Karsch, S. (2019). On-target temporal characterization of optical pulses at relativistic intensity. Light: Science & Applications, 8, Article ID 96.
Open this publication in new window or tab >>On-target temporal characterization of optical pulses at relativistic intensity
Show others...
2019 (English)In: Light: Science & Applications, ISSN 2095-5545, E-ISSN 2047-7538, Vol. 8, article id 96Article in journal (Refereed) Published
Abstract [en]

High-field experiments are very sensitive to the exact value of the peak intensity of an optical pulse due to the nonlinearity of the underlying processes. Therefore, precise knowledge of the pulse intensity, which is mainly limited by the accuracy of the temporal characterization, is a key prerequisite for the correct interpretation of experimental data. While the detection of energy and spatial profile is well established, the unambiguous temporal characterization of intense optical pulses, another important parameter required for intensity evaluation, remains a challenge, especially at relativistic intensities and a few-cycle pulse duration. Here, we report on the progress in the temporal characterization of intense laser pulses and present the relativistic surface second harmonic generation dispersion scan (RSSHG-D-scan)-a new approach allowing direct on-target temporal characterization of high-energy, few-cycle optical pulses at relativistic intensity.

Place, publisher, year, edition, pages
Nature Publishing Group, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-164975 (URN)10.1038/s41377-019-0207-1 (DOI)000491486800002 ()31666950 (PubMedID)
Available from: 2019-11-12 Created: 2019-11-12 Last updated: 2019-11-12Bibliographically approved
Cardenas, D. E., Ostermayr, T. M., Di Lucchio, L., Hofmann, L., Kling, M. F., Gibbon, P., . . . Veisz, L. (2019). Sub-cycle dynamics in relativistic nanoplasma acceleration. Scientific Reports, 9, Article ID 7321.
Open this publication in new window or tab >>Sub-cycle dynamics in relativistic nanoplasma acceleration
Show others...
2019 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 9, article id 7321Article in journal (Refereed) Published
Abstract [en]

The interaction of light with nanometer-sized solids provides the means of focusing optical radiation to sub-wavelength spatial scales with associated electric field enhancements offering new opportunities for multifaceted applications. We utilize collective effects in nanoplasmas with sub-two-cycle light pulses of extreme intensity to extend the waveform-dependent electron acceleration regime into the relativistic realm, by using 106 times higher intensity than previous works to date. Through irradiation of nanometric tungsten needles, we obtain multi-MeV energy electron bunches, whose energy and direction can be steered by the combined effect of the induced near-field and the laser field. We identified a two-step mechanism for the electron acceleration: (i) ejection within a sub-half-optical-cycle into the near-field from the target at >TVm−1 acceleration fields, and (ii) subsequent acceleration in vacuum by the intense laser field. Our observations raise the prospect of isolating and controlling relativistic attosecond electron bunches, and pave the way for next generation electron and photon sources.

National Category
Accelerator Physics and Instrumentation Atom and Molecular Physics and Optics Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:umu:diva-159428 (URN)10.1038/s41598-019-43635-3 (DOI)000467709100063 ()31086214 (PubMedID)
Available from: 2019-05-27 Created: 2019-05-27 Last updated: 2019-06-19Bibliographically approved
Jahn, O., Leshchenko, V. E., Tzallas, P., Kassel, A., Krueger, M., Muenzer, A., . . . Karsch, S. (2019). Towards intense isolated attosecond pulses from relativistic surface high harmonics. Optica, 6(3), 280-287
Open this publication in new window or tab >>Towards intense isolated attosecond pulses from relativistic surface high harmonics
Show others...
2019 (English)In: Optica, ISSN 2334-2536, Vol. 6, no 3, p. 280-287Article in journal (Refereed) Published
Abstract [en]

Relativistic surface high harmonics have been considered a unique source for the generation of intense isolated attosecond pulses in the extreme ultra-violet and x-ray spectral ranges. Their practical realization, however, is still a challenging task and requires identification of optimum experimental conditions and parameters. Here, we present measurements and particle-in-cell simulations to determine the optimum values for the most important parameters. In particular, we investigate the dependence of harmonics efficiency, divergence, and beam quality on the pre-plasma scale length as well as identify the optimum conditions for generation of isolated attosecond pulses by measuring the dependence of the harmonics spectrum on the carrier - envelope phase of the driving infrared field. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Place, publisher, year, edition, pages
Optical Society of America, 2019
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-157952 (URN)10.1364/OPTICA.6.000280 (DOI)000461769200007 ()
Available from: 2019-04-17 Created: 2019-04-17 Last updated: 2019-04-17Bibliographically approved
Tan, J., Forget, N., Borot, A., Kaplan, D., Tournois, P., Muschet, A. & Veisz, L. (2018). Dispersion control for temporal contrast optimization. Optics Express, 26(19), 25003-25012
Open this publication in new window or tab >>Dispersion control for temporal contrast optimization
Show others...
2018 (English)In: Optics Express, ISSN 1094-4087, E-ISSN 1094-4087, Vol. 26, no 19, p. 25003-25012Article in journal (Refereed) Published
Abstract [en]

We investigate the temporal contrast of the Light Wave Synthesizer 20 (LWS-20): a powerful, few-cycle source based on the optical parametric synthesizer principle. Saturation effects in the RF amplifier driving the acousto-optic programmable dispersive filter (AOPDF) were found to degrade the coherent contrast for non-monotonic group delay corrections. We subsequently present a new dispersion scheme and design a novel transmission grism-based stretcher optimized for LWS-20. The resulting temporal contrast of the amplified, compressed output pulses is improved by 2-4 orders of magnitude compared to the former design.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-151849 (URN)10.1364/OE.26.025003 (DOI)000444705000059 ()
Funder
Swedish Research Council, 2016-05409
Available from: 2018-09-13 Created: 2018-09-13 Last updated: 2018-10-05Bibliographically approved
Rivas, D., Major, B., Weidman, M., Helml, W., Marcus, G., Kienberger, R., . . . Veisz, L. (2018). Propagation-enhanced generation of intense high-harmonic continua in the 100-eV spectral region. Optica, 5(10), 1283-1289
Open this publication in new window or tab >>Propagation-enhanced generation of intense high-harmonic continua in the 100-eV spectral region
Show others...
2018 (English)In: Optica, ISSN 2334-2536, Vol. 5, no 10, p. 1283-1289Article in journal (Refereed) Published
Abstract [en]

The study of core electron dynamics through nonlinear spectroscopy requires intense isolated attosecond extremeultraviolet or even X-ray pulses. A robust way to produce these pulses is high-harmonic generation (HHG) in agas medium. However, the energy upscaling of the process depends on a very demanding next-generation laser technologythat provides multi-terawatt (TW) laser pulses with few-optical-cycle duration and controlled electric field.Here, we revisit the HHG process driven by 16-TW sub-two-cycle laser pulses to reach high intensity in the 100-eVspectral region and beyond. We show that the combination of above barrier-suppression intensity with a long generationmedium significantly enhances the isolation of attosecond pulses compared to lower intensities and/or shortermedia and this way reduces the pulse duration as well as field-stability requirements on the laser driver. This novelregime facilitates the real-time observation of electron dynamics at the attosecond timescale in atoms, molecules, andsolids.

National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-152610 (URN)10.1364/OPTICA.5.001283 (DOI)000447853100017 ()2-s2.0-85055630738 (Scopus ID)
Funder
Swedish Research Council, 2016-05409
Available from: 2018-10-15 Created: 2018-10-15 Last updated: 2018-12-13Bibliographically approved
Kormin, D., Borot, A., Ma, G., Dallari, W., Bergues, B., Aladi, M., . . . Veisz, L. (2018). Spectral interferometry with waveform-dependent relativistic high-order harmonics from plasma surfaces. Nature Communications, 9, Article ID 4992.
Open this publication in new window or tab >>Spectral interferometry with waveform-dependent relativistic high-order harmonics from plasma surfaces
Show others...
2018 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 9, article id 4992Article in journal (Refereed) Published
Abstract [en]

The interaction of ultra-intense laser pulses with matter opened the way to generate the shortest light pulses available nowadays in the attosecond regime. Ionized solid surfaces, also called plasma mirrors, are promising tools to enhance the potential of attosecond sources in terms of photon energy, photon number and duration especially at relativistic laser intensities. Although the production of isolated attosecond pulses and the understanding of the underlying interactions represent a fundamental step towards the realization of such sources, these are challenging and have not yet been demonstrated. Here, we present laser-waveform-dependent high-order harmonic radiation in the extreme ultraviolet spectral range supporting well-isolated attosecond pulses, and utilize spectral interferometry to understand its relativistic generation mechanism. This unique interpretation of the measured spectra provides access to unrevealed temporal and spatial properties such as spectral phase difference between attosecond pulses and field-driven plasma surface motion during the process.

Place, publisher, year, edition, pages
Nature Publishing Group, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-153682 (URN)10.1038/s41467-018-07421-5 (DOI)000451176100017 ()
Funder
Swedish Research Council, 2016-05409
Available from: 2018-11-27 Created: 2018-11-27 Last updated: 2018-12-19Bibliographically approved
Bergues, B., Rivas, D. E., Weidman, M., Muschet, A., Helml, W., Guggenmos, A., . . . Veisz, L. (2018). Tabletop nonlinear optics in the 100-eV spectral region. Optica, 5(3), 237-242
Open this publication in new window or tab >>Tabletop nonlinear optics in the 100-eV spectral region
Show others...
2018 (English)In: Optica, ISSN 2334-2536, Vol. 5, no 3, p. 237-242Article in journal (Refereed) Published
Abstract [en]

Nonlinear light-matter interactions in the extreme ultraviolet (XUV) are a prerequisite to perform XUV-pump/XUV-probe spectroscopy of core electrons. Such interactions are now routinely investigated at free-electron laser (FEL) facilities. Yet, electron dynamics are often too fast to be captured with the femtosecond resolution of state-of-the-art FELs. Attosecond pulses from laser-driven XUV-sources offer the necessary temporal resolution. However, intense attosecond pulses supporting nonlinear processes have only been available for photon energy below 50 eV, precluding XUV-pump/XUV-probe investigation of typical inner-shell processes. Here, we surpass this limitation by demonstrating two-photon absorption from inner electronic shells of xenon at photon energies around 93 eV and 115 eV. This advance opens the door for attosecond real-time observation of nonlinear electron dynamics deep inside atoms.

Place, publisher, year, edition, pages
Optical Society of America, 2018
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-146429 (URN)10.1364/OPTICA.5.000237 (DOI)000428145500003 ()2-s2.0-85044288308 (Scopus ID)
Available from: 2018-05-08 Created: 2018-05-08 Last updated: 2018-09-14Bibliographically approved
Tzallas, P., Bergues, B., Rompotis, D., Tsatrafyllis, N., Chatziathanassiou, S., Muschet, A., . . . Charalambidis, D. (2018). Time gated ion microscopy of light-atom interactions. Journal of Optics, 20(2), Article ID 024018.
Open this publication in new window or tab >>Time gated ion microscopy of light-atom interactions
Show others...
2018 (English)In: Journal of Optics, ISSN 2040-8978, E-ISSN 2040-8986, Vol. 20, no 2, article id 024018Article in journal (Refereed) Published
Abstract [en]

The development of ultra-short intense laser sources in the visible and extreme ultraviolet (XUV) spectral range has led to fascinating studies in laser-matter interactions and attosecond science. In the majority of these studies, the system under investigation interacts with a focused light beam, which ionizes the system. The ionization products are usually measured by devices, which spatiotemporally integrate the ionization signal originating from the entire focal area, discarding in this way valuable information about the ionization dynamics that take place in the interaction volume. Here, we review a recently developed approach in measuring the spatially resolved photoionization yields resulting from the interaction of infrared (IR)/XUV ultra-short light pulses in gas phase media. We show how this approach enables (a) the in situ focus diagnostic, (b) quantitative studies of linear and non-linear ionization processes in the IR/XUV regime, (c) single-shot XUV-pump-XUV-probe studies and (d) single-shot 2nd-order XUV autocorrelation measurements.

Place, publisher, year, edition, pages
IOP Publishing, 2018
Keywords
attosecond, harmonic generation, attosecond metrology, XUV-pump-XUV-probe, imaging
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:umu:diva-144816 (URN)10.1088/2040-8986/aaa326 (DOI)000423358700002 ()
Note

Special issue on emerging attosecond technologies

Available from: 2018-03-05 Created: 2018-03-05 Last updated: 2018-06-09Bibliographically approved
Projects
Relativistic electron diffraction [2016-05409_VR]; Umeå University
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7694-9066

Search in DiVA

Show all publications