Abstract
We have concentrated on studying nonlinear interaction of a simple atom or molecule with VUV/XUV high-order harmonic (HOH) fields without help of intense visible laser field[1]. This is owing to the fact that the pulse energy of an attosecond pulse train (APT) synthesized with the HOH fields is sufficiently high due to our original scheme of HOH generation with loosely focused geometry. Nevertheless, there were two practical issues in our studies, one of which is the long data-acquisition time required for the measurements, and another of which is temporal shape of the APT. The repetition rate of the pumping femtosecond laser pulse was only 10 Hz, and the train of the attosecond pulses appears 10-20 fs long, which is somewhat longer than the typical time scale of a nuclear motion in a molecule.
© 2011 Optical Society of America
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