Optimizing High Harmonic Generation in Absorbing Gases: Model and Experiment
E. ConstantELIA/CPMOH, Université Bordeaux 1, Cours de la Libération, 33405 Talence, FranceD. GarzellaServices des Photons, Atomes et Molécules DSM-DRECAM, CEA Saclay, 91191 Gif-sur-yvette, FranceP. BregerServices des Photons, Atomes et Molécules DSM-DRECAM, CEA Saclay, 91191 Gif-sur-yvette, FranceE. MévelELIA/CPMOH, Université Bordeaux 1, Cours de la Libération, 33405 Talence, FranceC. DorrerLaboratoire d'Optique Appliquée, ENSTA-Ecole-Polytechnique, 91761 Palaiseau, FranceC. Le BlancLaboratoire d'Optique Appliquée, ENSTA-Ecole-Polytechnique, 91761 Palaiseau, FranceF. SalinELIA/CPMOH, Université Bordeaux 1, Cours de la Libération, 33405 Talence, FrancePierre AgostiniServices des Photons, Atomes et Molécules DSM-DRECAM, CEA Saclay, 91191 Gif-sur-yvette, France
1999en
ABI
Annotatsiya
We study high-order harmonic generation in the general case of absorbing and dispersive atomic gas media. For ultrashort laser pulses, the harmonic conversion efficiency tends to a limit mainly imposed by the harmonic reabsorption in the gas. This limit, independent on the gas density, is the same for both the case of a loosely focused beam or a beam guided in a gas-filled hollow-core fiber. Under optimum conditions, we measured the highest conversion efficiency to date $(4\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5})$ for the 15th harmonic generated in xenon using a 40 fs, 1.5 mJ, 800 nm pulse at a 1 kHz repetition rate.
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