Observation of a train of attosecond pulses from high harmonic generation.


In principle, the temporal beating of superposed high harmonics obtained by focusing a femtosecond laser pulse in a gas jet can produce a train of very short intensity spikes, depending on the relative phases of the harmonics. We present a method to measure such phases through two-photon, two-color photoionization. We found that the harmonics are locked in phase and form a train of 250-attosecond pulses in the time domain. Harmonic generation may be a promising source for attosecond time-resolved measurements.

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@article{Paul2001ObservationOA, title={Observation of a train of attosecond pulses from high harmonic generation.}, author={Pierre M Paul and Edmond Toma and Pierre Breger and Genevi{\`e}ve Mullot and Frederika Aug{\'e} and Ph Balcou and H. G. Muller and Pierre Agostini}, journal={Science}, year={2001}, volume={292 5522}, pages={1689-92} }