Ponderomotive shearing for spectral interferometry of extreme-ultraviolet pulses.
We propose a novel method for completely characterizing ultrashort pulses at extreme-ultraviolet (XUV) wavelengths by adapting the technique of spectral phase interferometry for direct electric-field reconstruction to this spectral region. Two-electron wave packets are coherently produced by photoionizing atoms with two time-delayed replicas of the XUV pulse. For one of the XUV pulses, photoionization occurs in the presence of a strong infrared pulse that ponderomotively shifts the binding energy, thereby providing the spectral shear needed for reconstruction of the spectral phase of the XUV pulse.
Mauritsson
Johan
J
Department of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00 Lund, Sweden. johan.mauritsson@fysik.lth.se
López-Martens
Rodrigo
R
L'Huillier
Anne
A
Schafer
Kenneth J
KJ