Observation of a Train of Attosecond Pulses from High Harmonic Generation

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Science  01 Jun 2001:
Vol. 292, Issue 5522, pp. 1689-1692
DOI: 10.1126/science.1059413

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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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