%0 Journal Article
%T Experimental observation of anomalous high harmonics at low intensities
%+ Laboratoire d'optique appliquée (LOA)
%A Valentin, C.
%A Kazamias, S.
%A Douillet, D.
%A Grillon, G.
%A Lefrou, Thierry
%A Auge-Rochereau, Frederika
%A Sebban, Stéphane
%A Balcou, Philippe
%< avec comité de lecture
%@ 0946-2171
%J Applied Physics B - Laser and Optics
%I Springer Verlag
%V 78
%N 7-8
%P 845–849
%8 2004-03-30
%D 2004
%R 10.1007/s00340-004-1478-6
%Z PACS 42.65.Ky; 32.80.Rm
%Z Physics [physics]/Physics [physics]/Optics [physics.optics]Journal articles
%X A variety of complex phenomena occurs when an ultra-short laser pulse interacts with atoms in the 10^13 W/cm^2 range: non-sequential ionisation, electron recollision, and Freeman resonances. We show that high-harmonic spectra obtained experimentally in this parameter range also display anomalous features, which are difficult to understand in the framework of the three-step, semiclassical model. The results of a systematic study of these high harmonics generated in argon, xenon, and krypton are presented. From the experimental curves, complex high-order harmonic generation phenomena are discussed.
%G English
%L hal-00522729
%U https://hal-polytechnique.archives-ouvertes.fr/hal-00522729
%~ X
%~ ENSTA
%~ CNRS
%~ X-LOA
%~ X-DEP
%~ X-DEP-PHYS
%~ PARISTECH
%~ ENSTA_LOA