= P. M. Paul
{c}
P. M. Paul coauthored an experiment that reconstructed a train of $250$-<attosecond> <optical pulses> from <high harmonic generation>. Two-color <photoionization> measurements determined relative harmonic <phases>, connecting the measured electron signal to the short-pulse structure.<Observation of a Train of Attosecond Pulses from High Harmonic Generation by P. M. Paul and others>[Science 292 (2001), pp. 1689–1691: author list and abstract; Fig. 1 photoelectron sidebands, Fig. 2 apparatus and Fig. 4 reconstructed 250-as peaks.]{ref}
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