We present the first measurement of the attosecond emission
generated from underdense plasma produced on a solid target. We generate
high-order harmonics of a femtosecond Ti:sapphire laser focused in a
weakly ionized underdense chromium plasma. Using the .Reconstruc-
tion of Attosecond Beating by Interference of Two-photon Transitions.
(RABITT) technique, we show that the 11thto the 19thharmonic orders
form in the time domain an attosecond pulse train with each pulse having
300 as duration, which is only 1.05 times the theoretical Fourier transform
limit. Measurements reveal a very low positive group delay dispersion of
4200 as2. Beside its fundamental interest, high-order harmonic generation
in plasma plumes could thus provide an intense source of attosecond pulses
for applications.
http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-19-4-3677
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