Ultrafast spatiotemporal dynamics of terahertz generation by ionizing two-color femtosecond pulses in gases.
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.
Babushkin
I
I
Weierstraß-Institut für Angewandte Analysis und Stochastik, 10117 Berlin, Germany.
Kuehn
W
W
Köhler
C
C
Skupin
S
S
Bergé
L
L
Reimann
K
K
Woerner
M
M
Herrmann
J
J
Elsaesser
T
T