title: Ultrafast spatiotemporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases.
abstract: We present a combined theoretical and experimental study of spatiotemporal propagation effects in terahertz (THz) generation in gases using two-color ionizing laser pulses. The observed strong broadening of the THz spectra with increasing gas pressure reveals the prominent role of spatiotemporal reshaping and of a plasma-induced blueshift of the pump pulses in the generation process. Results obtained from (3+1)-dimensional simulations are in good agreement with experimental findings and clarify the mechanisms responsible for THz emission.
authors.affiliation: Weierstraß-Institut für Angewandte Analysis und Stochastik, 10117 Berlin, Germany.
authors.forename: I
authors.initials: I
authors.lastname: Babushkin
authors.forename: W
authors.initials: W
authors.lastname: Kuehn
authors.forename: C
authors.initials: C
authors.lastname: Köhler
authors.forename: S
authors.initials: S
authors.lastname: Skupin
authors.forename: L
authors.initials: L
authors.lastname: Bergé
authors.forename: K
authors.initials: K
authors.lastname: Reimann
authors.forename: M
authors.initials: M
authors.lastname: Woerner
authors.forename: J
authors.initials: J
authors.lastname: Herrmann
authors.forename: T
authors.initials: T
authors.lastname: Elsaesser