Génération et caractérisation d'impulsions attosecondes

Abstract : Attosecond pulse trains in the extreme ultraviolet range can be produced by high-order harmonic generation, by focusing an intense femtosecond pulse in a rare gas jet. In this thesis, we present a temporal characterization of this radiation on the femtosecond and attosecond timescales.
By transposing a spectral interferometry technique commonly used in the infrared range (SPIDER), we make a complete single-shot characterization of the temporal profile of individual harmonics, on the femtosecond timescale.
In a second part, we study experimentally the attosecond structure of the harmonic radiation, and demonstrate a temporal drift in the emission: the lowest harmonics are emitted before the highest ones. This chirp, which is directly related to the electron dynamics in the generation process, imposes a lower limit to the duration that can be achieved by increasing the spectral range. We show how generating conditions can be optimized in order to enhance the synchronization in the emission, and how attosecond pulses can be recompressed.
Last, we propose a new technique for the complete characterization of arbitrary attosecond pulses: FROG CRAB. This method would allow simultaneous measurements of the femtosecond and attosecond structures of the radiation, and thus a complete knowledge of the attosecond light source in the perspective of applications.
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https://tel.archives-ouvertes.fr/tel-00011620
Contributor : Yann Mairesse <>
Submitted on : Wednesday, February 15, 2006 - 3:26:19 PM
Last modification on : Sunday, February 18, 2018 - 9:26:26 AM
Long-term archiving on : Saturday, April 3, 2010 - 10:24:52 PM

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Yann Mairesse. Génération et caractérisation d'impulsions attosecondes. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2005. Français. ⟨tel-00011620⟩

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