Abstract
Quantitative investigations are made into the quantum enhancements achieved in laser-assisted photoionizations for attosecond extreme-ultraviolet (xuv) pulses with different chip properties. An improved pulse reconstruction scheme is presented based on the analysis of two photoelectron energy spectra (PESs) measured with different laser intensities. A direct procedure is developed to completely reconstruct the intensity and chirp of an isolated pulse (within one-half the laser period) with high precision. Results show root-mean-square frequency (time) differences less than 0.8 eV (2 as, except for a few data points near the start and/or end of the pulse). A stereo measurement (recording PESs from two opposite directions along the direction of laser polarization) is needed to reconstruct a broad bandwidth xuv pulse with a nonmonotonous instantaneous frequency.
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