Abstract

We propose a two-color pumping scheme to characterize attosecond extreme ultraviolet (XUV) pulses. The fundamental and its second harmonic of a femtosecond Ti:sapphire laser create a coherent superposition of the 4p and 5p states of K, and we retrieve the spectral phase of the XUV pulse from the phase offset of the photoelectron signal as a function of time delay after the pump pulse. The scheme is technically simple and efficient to characterize 100as pulses.

© 2011 Optical Society of America

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