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.
Paul
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PM
Commissariat à l'Energie Atomique DRECAM/SPAM, Centre d'Etudes de Saclay, 91191 Gif-sur-Yvette, France.
Toma
E S
ES
Breger
P
P
Mullot
G
G
Auge
F
F
Balcou
P
P
Muller
H G
HG
Agostini
P
P