P. M. Paul coauthored an experiment that reconstructed a train of -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.[ref]
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.
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