Experimental observation of anomalous high harmonics at low intensities

Abstract : 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.
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Submitted on : Friday, October 1, 2010 - 3:10:02 PM
Last modification on : Wednesday, July 3, 2019 - 10:48:02 AM

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C. Valentin, S. Kazamias, D. Douillet, G. Grillon, Thierry Lefrou, et al.. Experimental observation of anomalous high harmonics at low intensities. Applied Physics B - Laser and Optics, Springer Verlag, 2004, 78 (7-8), pp.845-849. ⟨10.1007/s00340-004-1478-6⟩. ⟨hal-00522729⟩

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