Abstract
A variety of complex phenomena occurs when an ultra-short laser pulse interacts with atoms in the 1013 W/cm2 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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42.65.Ky; 32.80.Rm
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Valentin, C., Kazamias, S., Douillet, D. et al. Experimental observation of anomalous high harmonics at low intensities. Appl Phys B 78, 845–849 (2004). https://doi.org/10.1007/s00340-004-1478-6
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DOI: https://doi.org/10.1007/s00340-004-1478-6