Spatial and temporal aspects of intense attosecond pulses for pump-probe experiments

Hampus Wikmark

Research output: ThesisDoctoral Thesis (compilation)

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Abstract

Nuclear and electronic dynamics in atoms and molecules are the foundation of many physical processes and chemical reactions. Often, these dynamics take place on timescales so much shorter than those commonly encountered that they are called ultrafast.

In order to study ultrafast phenomena, time-resolved techniques such as pump-probe experiments, involving ultrafast light pulses, are necessary. For these experiments to be successful, the properties of ultrafast light pulses must be carefully controlled and examined in order to discern their influence on the experiment.

This thesis deals with the spatial and temporal properties of XUV light, generated through the process of high-order harmonic generation in gases, using an intense IR laser beam. The influence of the spatial properties of this generating laser on the XUV has been studied, as has the influence of the XUV light's spatial properties on its focusability and peak intensity.

The generated high-order harmonics are also used to study physical phenomena such as multiphoton ionization, something that requires high intensities. An instrument for simultaneous studies of ions and electrons produced by photoionization is also presented.

The efforts towards ultrafast pump-probe experiments include designs for interferometer setups to enable these experiments. Some preliminary results of interferometer testing are also given, including a proof of principle of XUV-IR pump-probe experiments on the Lund Laser Centre intense XUV beamline.
Translated title of the contributionSpatiella och tidsmässiga aspekter av intensiva attosekundpulser för pump-prob-experiment
Original languageEnglish
QualificationDoctor
Supervisors/Advisors
  • Eng-Johnsson, Per, Supervisor
  • L'huillier, Anne, Assistant supervisor
Award date2019 May 17
Place of PublicationLund
Publisher
ISBN (Print)978-91-7895-042-3
ISBN (electronic) 978-91-7895-043-0
Publication statusPublished - 2019 Apr 23

Bibliographical note

Defence details
Date: 2019-05-17
Time: 09:15
Place: Rydbergsalen, Fysicum, Professorsgatan 1, Lund University, Faculty of Engineering LTH
External reviewer(s)
Name: Mével, Eric
Title: Professor
Affiliation: Université de Bordeaux, France
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Subject classification (UKÄ)

  • Atom and Molecular Physics and Optics
  • Other Engineering and Technologies not elsewhere specified

Keywords

  • ultrafast lasers
  • ultrafast optics
  • attosecond pulses
  • pump-probe experiments
  • XUV light
  • XUV focusing
  • wavefront sensing
  • XUV optics
  • X-ray optics
  • Fysicumarkivet A:2019:Wikmark

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