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    Experimental observation of anomalous high harmonics at low intensities

    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-harmo...

    C. Valentin, S. Kazamias, D. Douillet, G. Grillon, T. Lefrou, F. Augé… in Applied Physics B (2004)