RT Journal Article
SR Electronic
T1 Observation of a Train of Attosecond Pulses from High Harmonic Generation
JF Science
JO Science
FD American Association for the Advancement of Science
SP 1689
OP 1692
DO 10.1126/science.1059413
VO 292
IS 5522
A1 Paul, P. M.
A1 Toma, E. S.
A1 Breger, P.
A1 Mullot, G.
A1 Augé, F.
A1 Balcou, Ph.
A1 Muller, H. G.
A1 Agostini, P.
YR 2001
UL http://science.sciencemag.org/content/292/5522/1689.abstract
AB 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.