Umeå University's logo

umu.sePublications
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Spatio-spectral couplings in optical parametric amplifiers
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-2910-6549
Université libre de Bruxelles, Brussels, Belgium.ORCID iD: 0000-0002-5783-2081
Umeå University, Faculty of Science and Technology, Department of Physics.
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0001-6538-8606
Show others and affiliations
2023 (English)In: Optics Express, E-ISSN 1094-4087, Vol. 31, no 8, p. 12036-12048Article in journal (Refereed) Published
Abstract [en]

Optical parametric amplification (OPA) is a powerful tool for the generation of ultrashort light pulses. However, under certain circumstances, it develops spatio-spectral couplings, color dependent aberrations that degrade the pulse properties. In this work, we present a spatio-spectral coupling generated by a non-collimated pump beam and resulting in the change of direction of the amplified signal with respect to the input seed. We experimentally characterize the effect, introduce a theoretical model to explain it as well as reproduce it through numerical simulations. It affects high-gain non-collinear OPA configurations and becomes especially relevant in sequential optical parametric synthesizers. In collinear configuration, however, beyond the direction change, also angular and spatial chirp is produced. We obtain with a synthesizer about 40% decrease in peak intensity in the experiments and local elongation of the pulse duration by more than 25% within the spatial full width at half maximum at the focus. Finally, we present strategies to correct or mitigate the coupling and demonstrate them in two different systems. Our work is important for the development of OPA-based systems as well as few-cycle sequential synthesizers.

Place, publisher, year, edition, pages
2023. Vol. 31, no 8, p. 12036-12048
National Category
Atom and Molecular Physics and Optics
Identifiers
URN: urn:nbn:se:umu:diva-206141DOI: 10.1364/oe.483534ISI: 000975288600003Scopus ID: 2-s2.0-85152475606OAI: oai:DiVA.org:umu-206141DiVA, id: diva2:1746725
Funder
Swedish Research Council, 2019-02376Swedish Research Council, 2020-05111Knut and Alice Wallenberg Foundation, 2019.0140The Kempe Foundations, SMK21-0017Available from: 2023-03-29 Created: 2023-03-29 Last updated: 2023-09-05Bibliographically approved
In thesis
1. Enhancement of few-cycle light fields for relativistic nanophotonics
Open this publication in new window or tab >>Enhancement of few-cycle light fields for relativistic nanophotonics
2023 (English)Doctoral thesis, comprehensive summary (Other academic)
Alternative title[sv]
Förbättring av få-cykliska ljusfält för relativistisk nanofotonik
Abstract [en]

Pulses of light that are both ultrashort and ultraintense are often generated using optical parametric amplifiers (OPA). These are capable of driving highly non-linear interactions with matter, which are interesting when studying the fundamental laws of our universe. Furthermore, they are also used in many scientific and industrial applications, such as particle accelerators, inertial-confinement nuclear fusion, and medical diagnostics and treatment. This thesis explores the diagnostic and optimization of pulses of light with extreme properties and utilizes them to drive electron acceleration.

The applied light pulses with very short duration (<5 fs) and high peak power (>10 TW) are sensitive to develop spatio-temporal aberrations. These are color-dependent distortions that can significantly degrade the pulse properties, like peak-intensity, and affect their applicability. Furthermore, in most cases they are not easy to correctly diagnose, with current tools failing to provide widely applicable solutions. In this thesis, we describe a new type of spatio-temporal coupling that is especially relevant for optical parametric synthesizers (OPS), systems that coherently combine multiple OPA stages. To do this, we have contributed to the development of two methods for the characterization of such aberrations, the so-called simplified-INSIGHT and HASO multispectral. These enabled us to further improve the structure of our OPS and laser systems.

We also explored the applicability of light pulses to drive relativistic electron acceleration in vacuum. To this end, an injection system using nanotips is presented, capable of inserting electrons spatially in the focus and temporally in the most intense light-cycle. This way, vacuum laser accelerated electrons of up to 14 MeV were detected using a tight focusing configuration (f#1) and their properties characterized. Furthermore, we investigated the dependence of the acceleration process when the focusing geometry is relaxed (f#3). This resulted in the unexpected outcome of similar electron energies in both cases, although the intensity was ten times reduced. This indicates that the decrease in accelerating field strength is compensated by longer acceleration lengths, which is not predicted by currently existing analytical models. 

Place, publisher, year, edition, pages
Umeå: Umeå University, 2023. p. 125
Keywords
Vacuum laser acceleration, spatio-spectral characterization, relativistic nanophotonics, optical parametric synthesis
National Category
Atom and Molecular Physics and Optics
Research subject
Physics
Identifiers
urn:nbn:se:umu:diva-208146 (URN)978-91-8070-094-8 (ISBN)978-91-8070-093-1 (ISBN)
Public defence
2023-06-08, Lilla hörsalen - KBE301, KBC building, Umeå, 13:00 (English)
Opponent
Supervisors
Funder
Swedish Research Council, 2019-02376Knut and Alice Wallenberg Foundation, 2019.0140The Kempe Foundations, SMK21-0017Swedish Research Council, 2020-05111
Available from: 2023-05-17 Created: 2023-05-10 Last updated: 2024-05-10Bibliographically approved

Open Access in DiVA

fulltext(3880 kB)157 downloads
File information
File name FULLTEXT01.pdfFile size 3880 kBChecksum SHA-512
b97b8d456d1a7a6257cf1234fe0da7e32b00ff4125ce2dc21b489fc65257723b9439284812d6dd83a5547f2c33235ecb473da2dcdf03065ffa7500fe730029bc
Type fulltextMimetype application/pdf

Other links

Publisher's full textScopus

Authority records

de Andres Gonzalez, AitorFischer, PeterMuschet, Alexander A.Schnur, FritzVeisz, Laszlo

Search in DiVA

By author/editor
de Andres Gonzalez, AitorJolly, Spencer W.Fischer, PeterMuschet, Alexander A.Schnur, FritzVeisz, Laszlo
By organisation
Department of Physics
In the same journal
Optics Express
Atom and Molecular Physics and Optics

Search outside of DiVA

GoogleGoogle Scholar
Total: 157 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 391 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf