title: Time-frequency characterization of femtosecond extreme ultraviolet pulses.
abstract: We present energy-resolved cross-correlation measurements of an extreme ultraviolet (XUV) pulse, generated as the fifth harmonic (15.5 eV) of an intense 80 fs laser pulse centered at 400 nm. Spectrally resolving the cross-correlation signal allows us to characterize the time-dependent frequency of the XUV pulse. We find that the fifth harmonic has a small negative chirp in excess of that predicted by perturbation theory. In addition, by manipulating the chirp of the driving laser we can induce and measure a positive or a negative chirp on the XUV pulse.
authors: Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden.
authors: J
authors: J
authors: Norin
authors: J
authors: J
authors: Mauritsson
authors: A
authors: A
authors: Johansson
authors: M K
authors: MK
authors: Raarup
authors: S
authors: S
authors: Buil
authors: A
authors: A
authors: Persson
authors: O
authors: O
authors: Dühr
authors: M B
authors: MB
authors: Gaarde
authors: K J
authors: KJ
authors: Schafer
authors: U
authors: U
authors: Keller
authors: C-G
authors: CG
authors: Wahlström
authors: A
authors: A
authors: L'Huillier