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Anne L'Huillier

Anne l'Huillier

Professor

Anne L'Huillier

Attosecond Wave Packet Metrology

Author

  • Marko Swoboda

Summary, in English

Attosecond pulses allow the study of electrons on their natural timescale. They are created from the interaction of atoms with ultrashort, intense laser pulses whose electric field approaches the strength of inner-atomic electric fields. This thesis presents experiments around the generation, characterization and application of attosecond pulses.



First, we study the influence of the atomic generation medium on the temporal properties of attosecond pulses. Their central photon energy can be controlled by using a two-color generation field and by thin-foil filtering techniques tailored to specific spectral bands. With these techniques, broadband attosecond pulses with durations down to 130 as have been measured. To characterize attosecond pulse trains at their birth, we introduce a new method that perturbs the generation laser field with its weak second harmonic. This allows us to assess the influence of the medium in the generation process. We then test the limits of a well-established pulse train characterization method with regard to probe intensity and demonstrate a way to circumvent these

limitations.



A second set of experiments uses attosecond pulses to excite atoms and molecules for the creation of ultrashort wave packets. Free electron wave packets can be controlled by an external laser field and driven to scatter off their parent ions. They also carry information on the atomic structure, which enables the phase-resolved characterization of unknown bound wave packets. Exposing molecules to attosecond pulses can trigger dissociation reactions that can be controlled by a delayed probe laser pulse. We present a study of different probe pulse properties and report the observation of attosecond electron dynamics inside a hydrogen molecule.

Department/s

  • Atomic Physics

Publishing year

2010

Language

English

Publication/Series

Lund Reports on Atomic Physics

Volume

414

Document type

Dissertation

Publisher

Department of Physics, Lund University

Topic

  • Atom and Molecular Physics and Optics

Keywords

  • Molecular dissociation
  • Electron wave packets
  • Pulse characterization
  • Two-color harmonic generation
  • Attosecond pulse trains
  • Single attosecond pulses
  • Resonant two-photon ionization
  • Fysicumarkivet A:2010:Swoboda

Status

Published

Supervisor

  • Anne L'Huillier

ISBN/ISSN/Other

  • ISSN: 0281-2762

Defence date

19 March 2010

Defence time

10:15

Defence place

Sal F, Fysicum, Professorsgatan 1, Lund University, Faculty of Engineering

Opponent

  • Gerhard G. Paulus