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Production et caractérisation d'impulsions attosecondes VUV par génération d'harmoniques d'ordre élevé.

Abstract : In the last decade the high-order harmonic generation (HHG) in gases induced by strong laser fields has shown a rising interest because of its capability to produce a train of sub-femtosecond pulses or even isolated attosecond pulse (1as=10-18s). This source can be used in pump-probe experiment to probe ultra-fast dynamic as electronic motion directly into atoms and molecules.
In CELIA, we have investigated first a technique of post-compression, which permit to compress our IR laser pulse from 40 fs to 9 fs (1fs=10-15s) to already confine the HHG. Since the HHG is only efficient with linear polarized field, in order to confine the VUV emission at less than an optical cycle, we have created into these sub-10 fs IR pulses a short gate where the laser field is linear polarized. In that way, we are able to control the VUV emission duration by controlling the gate duration. This technique called “ ellipticity gating” has been completely characterized in this thesis with 10 fs generated IR pulses. We show that our experimental technique permits to control continuously the attosecond pulses number until the generation of one or two attosecond pulses. In order to characterize temporally these attosecond pulses we have also developed an experimental two colors interferometer to extract the harmonic phase and the harmonic average envelope that are used to reconstruct the temporal profile of the attosecond pulses train.
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Contributor : Amelle Zair <>
Submitted on : Monday, November 6, 2006 - 12:07:00 PM
Last modification on : Thursday, July 26, 2018 - 12:07:53 PM
Long-term archiving on: : Thursday, September 20, 2012 - 2:22:23 PM


  • HAL Id : tel-00111726, version 1




Amelle Zair. Production et caractérisation d'impulsions attosecondes VUV par génération d'harmoniques d'ordre élevé.. Physique Atomique [physics.atom-ph]. Université Sciences et Technologies - Bordeaux I, 2006. Français. ⟨tel-00111726⟩



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