期刊
SCIENCE
卷 292, 期 5522, 页码 1689-1692出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1059413
关键词
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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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