Time-frequency characterization of high-order harmonic pulses
Department of Physics, Lund
Institute of Technology, P.O. Box 118, 221 00 Lund, Sweden
Corresponding author: a email@example.com
Published online: 24 April 2003
We present energy-resolved cross-correlation measurements of extreme ultraviolet (XUV) pulses generated as high harmonics of femtosecond pulses from a 1 kHz titanium-sapphire laser. The harmonic pulses are probed by a fraction of the fundamental laser pulse at 800 nm, in a noncollinear geometry, allowing us to vary independently the parameters of the harmonic pump and near-infrared probe pulses. We measure the so-called “sidebands” in the photoelectron spectrum of argon corresponding to the absorption of a harmonic photon plus or minus one probe photon. Spectrally resolving the cross-correlation signal allows us to characterize the time-dependent frequency of the XUV pulse.
PACS: 42.65.Ky – Harmonic generation, frequency conversion
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2003