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Groupe ATTOPHYSIQUE
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High order harmonics have been first oberved in Saclay and in Chicago in 1987. Since that time the ATTO Physics team has made important contributions to the development and applications of this technique. High harmonics properties have been invesigated, characterizing spatial profiles and phases, and intrinsic and mutual coherence. The temporal and spectral properties have been investigated, in particular through a two-color photoionization technique that resulted in a demonstration of attosecond pulses produced in high harmonics. Optimization of the XUV output has also been investigated (2 µJ demonstrated at 54nm). HHG at high laser energy (> 10mJ) and active spatial and spectral phase control are expected to further improve the output and subsequently broaden the range of applications.
Besides fundamental studies, the group aims at demonstrating the unique potential of harmonics in ultrafast XUV science. Applications of this ultra-short duration, coherence source have been performed in collaboration with diffrent laboratories: ultrafast evolution of electronic densities in denses plasmas using XUV interferometry, ultra-fast hot electron dynamics in dielectircs has been characterized using ultrafast UPS spectroscopy, C2H4 fragmentation has been studied in a pump(UV)-probe(VUV) experiment in the femtosecond regime.
Main publications:
"Attosecond Synchronisation of high harmonics soft X-rays"
Mairesse, Y. et al. Science , 2003, 5650 1540-1543.
Abstract Full text
"Feynman’s path integral approach for intense laser-atom interactions"
Salières, P. et al. Science 292, 902 (2001).
"Observation of a Train of Attosecond Pulses from High Harmonic Generation"
Paul, P.M. et al. Science 292, 1689 (2001)
The ATTO Physics group has collaborations with several labs in France (LOA,
CELIA, LIXAM, LCAR), Europe (e.g., LLC, AMOLF, CUSBO, Univ. Nijmegen) and outside
Europe (Brookhaven, Kurchatov Institute, Univ. Salt Lake City). The group is
a partner of the ATTO and PICNIC networks as well as an European Marie-Curie
training site. It contributes to joint research with European teams in LIMANS
III and LASERNET. Finally, it is associated to the Integrated Infrastructure
Initiative for large-scale laser facilities that will be submitted in FP6.
P.M. Curie grants are proposed to PhD students pursuing doctoral studies in another country of the European Community or associated state. Contact (see Eligibility).