title: Attosecond pulse walk-off in high-order harmonic generation.
abstract: We study the influence of the generation conditions on the group delay of attosecond pulses in high-order harmonic generation in gases. The group delay relative to the fundamental field is found to decrease with increasing gas pressure in the generation cell, reflecting a temporal walk-off due to the dispersive properties of the nonlinear medium. This effect is well reproduced using an on-axis phase-matching model of high-order harmonic generation in an absorbing gas.
authors.forename: D
authors.initials: D
authors.lastname: Kroon
authors.forename: D
authors.initials: D
authors.lastname: Guénot
authors.forename: M
authors.initials: M
authors.lastname: Kotur
authors.forename: E
authors.initials: E
authors.lastname: Balogh
authors.forename: E W
authors.initials: EW
authors.lastname: Larsen
authors.forename: C M
authors.initials: CM
authors.lastname: Heyl
authors.forename: M
authors.initials: M
authors.lastname: Miranda
authors.forename: M
authors.initials: M
authors.lastname: Gisselbrecht
authors.forename: J
authors.initials: J
authors.lastname: Mauritsson
authors.forename: P
authors.initials: P
authors.lastname: Johnsson
authors.forename: K
authors.initials: K
authors.lastname: Varjú
authors.forename: A
authors.initials: A
authors.lastname: L'huillier
authors.forename: C L
authors.initials: CL
authors.lastname: Arnold