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Updated: Aug 29, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
Published on: August 12, 2013
Ponderomotive shearing for spectral interferometry of extreme-ultraviolet pulses
Johan Mauritsson1, Rodrigo López-Martens, Anne L'Huillier
1Department of Physics, Lund Institute of Technology, P.O. Box 118, SE-221 00 Lund, Sweden. johan.mauritsson@fysik.lth.se
Abstract:
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.
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