Resonance-enhanced high-harmonic generation
E. S. TomaFOM-AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The NetherlandsPh AntoineFOM-AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The NetherlandsArmelle de BohanLaboratoire de Physique Atomique et Moleculaire, Universite Catholique de Louvain, Chemin du Cyclotron 2, B-1348 Louvain-la-Neuve, BelgiumH. G. MullerFOM-AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands
1999en
ABI
Abstract
In this paper we present some results of a high-harmonic generation experiment in argon, performed with a Ti:sapphire laser (787 nm, 140 fs) and a spatially shaped focus (flat top). The range of intensities is 3-100 TW cm-2. The intensity dependence of the harmonic signal shows an interesting behaviour of the 13th harmonic, namely an initial suppression followed by a strong enhancement at simeq85 TW cm-2, which exceeds the magnitude of the 11th harmonic. This behaviour is a consequence of a resonant atomic process. Numerical calculations were also performed. They partly reproduced the experiment.
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